Bosch router speed chart. PR20EVSK power tool pdf manual download.

Bosch router speed chart Bosch Coupon Thank You; Covid 19 response; Fixed-Base Routers — are you unsure what fits the best? Compare all tools in an overview chart. The Bosch 1617EVSPK 2. Jul 8, 2021 · Bosch GKF125CEN Colt 1. Also for: 1617evs, 1617evspk, 1618evs. 25 Horsepower Plunge Router & Fixed Base Router Kit with a Variable Speed 12 Amp Motor and RA1181 Benchtop Router Table Visit the Bosch Store 4. Easy to just re-type Up to 1in dia - 24,000 rpm max 1 1/4in - 2in dia - 18,000 rpm max Thanks Dave. View online(68 pages) or download PDF(4. Users can glide along the intended cutline using Oct 8, 2004 · Bosch 1617EVS wood router tool kit 12 amp 2 1/4 Horsepower fixed base hand router with 1/4 inch and 1/2 inch collets. 25 Horsepower Plunge Router & Fixed Base with a Variable Speed Motor(Router Tool Combo Kit) $ 99. Sep 5, 2023 · Equipped with a 12 AMP motor and an adjustable speed dial, the BOSCH 1617EVS wood router offers optimal control over its power. 25 HP and an amp rating of 12, both the Bosch and the DEWALT combo router tool kit deliver impressive power and speed. 5 hp Milwaukee router. com Jun 18, 2012 · I pulled some numbers off of the Vortex chipload chart (http://www. 25 hp plunge- and fixed-base router uses Constant Response™ circuitry to retain consistent speed. It features an optimised body design, making it a very compact corded edge router. Bosch E-Repair Network; Router Guides — are you unsure what fits the best? Compare all tools in an overview chart. Oct 11, 2022 · Bosch BOSCH RA1172AT 2-Piece Router Dust Extraction Vacuum Hook Kit with Included Hose Adapter Bosch BOSCH RA1175 Router Dust Extraction Hood for Edge-Forming Bosch BOSCH 1617EVS 2. The manual just gives a vague "match weight to speed" but no specifics. How Fast Should a Router Be Running? Router Bit Speed Chart. Apr 28, 2021 · PR20EVS Colt Palm Router features a 1. PR20EVSK power tool pdf manual download. PR20EVS Colt Palm Router features a 1. Compatible with Bosch 18V Power For All The rated speed of the accessory must be at least equal to the maximum speed marked on the power tool. The Bosch 1617EVS 2. It features a 2. ) A numbered dial, above, controls speed on all routers except the Skil. Dec 19, 2024 · Find your optimum speed . However, this chart is just a general guideline. With utmost accuracy, you will be able to experience this precision-machined and adjustable router that allows a variable speed range. Always prioritize safety by using the correct speed for each bit size and ensuring your workpiece is secure. ROUTER BASE ROUTER BASE If your router model is listed: 1. The Bosch 1617EVS 2. Router Tools. Experience optimal performance and portability with the Bosch GKF18V-25 18V Brushless Colt™ palm router, a cordless solution with the best power-to-size ratio in its class. View and Download Bosch 1617 operating/safety instructions manual online. Not worth linking. Constant Response Circuitry, the router will maintain a constant speed throughout the cut, resulting in clean, accurate product. Boasting 2. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST. a lot of folks have built there own tables. Bosch 1617 Feeds+Speeds - Free download as PDF File (. It comes with a storage case that has compartments for all the accessories. The Bosch MRF23EVS 2. Consult your router's user guide or the documentation that accompanied your particular bit for specific details on setting the appropriate speed for the bit. 25 horsepower (max) lets you feel the power in your hand. The PR20EVS is a palm router not intended for table use. I've got a Bosch 1617 router installed in mine and can adjust bit height from above, but I can also lift the router plate and router out together for height adjustment. DW Router Speed Chart Jan 10, 2022 · Hi Phil, Thank you for your question! If your router has a variable speed dial but doesn’t explicitly display the RPMs, you can typically find this information in the user manual or by referencing the speed settings chart provided by the manufacturer. The table lists dial positions from 1 to 6 corresponding to minimum and maximum RPM and chiploads for different size bits and materials like hardwoods, softwoods, MDF, plastics, and metals. (See chart. Sign In Upload. 11 Nov. Bosch Colt Palm Router Combination Kit Specifications. 4 %âãÏÓ 3 0 obj >stream xœ+är á26S°47R Iár á ä*T0T0BC %ç*èG¤ *¸ä+ r ÿB h endstream endobj 5 0 obj >/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]>>/MediaBox[0 0 612 1008]>> endobj 7 0 obj >stream xœ+är á26S°47R Iár á ä*T0T0BC %ç*èG¤ )¸ä+ r ÿI i endstream endobj 8 0 obj >/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]>>/MediaBox[0 0 612 1008]>> endobj 9 0 obj The Bosch GKF125CE Colt variable-speed palm-grip router with 1. There is a T-handle hex wrench that is used for depth adjustments for the fixed base on a router table. 26 0:55 GKF18V-25N Professional: Further information Product Highlights. May 14, 2009 · Combined with the Constant Response(tm) Circuitry, this variable speed feature makes setting the Bosch 1613AEVS up for the specific bit and species of wood being worked with simple and effective. Since this router was purchased for a router table, I had considered going with a larger 3. Compare. It comes with some of the highly sophisticated features that include a powerful motor, precision bases, soft, variable speed controls, and a couple of other advanced features. 99. 1617 wood router pdf manual download. The GKF 600 Professional corded edge router is the convenient specialist tool for precise edges. If you’re in need of a trim router, the Colt is a solid bet for any Pro. 55 MB) Bosch 1617PK Specifications • 1617PK power tools pdf manual download and more Bosch online manuals GMF 1600 CE Routers | Powerful 1,600 W motor and Constant Speed feature produce best working results, Patented 1/10-mm fine adjustment steps and variety of attachments for optimal depth regulation and versatility, SDS quick-change system for accurate and secure plunge base fitting BM 2610021461 06-12_BM 2610021461 06-12. You can select speeds ranging from 8,000 to 25,000 RPM, allowing you to adjust the tool’s performance to suit your specific project requirements. 25 HP Combination Plunge Fixed-Base Router Pack shown Carrying Case Included Featur For RA1141 Router Table, the Bosch router that will work is the 1617-Series Routers (in fixed base only). Users can glide along the intended cutline using dovetail The Bosch 1617EVSPK 2. 25 HP (Max) Variable-Speed Palm Router Combination Kit pairs a tool that lets you feel the power in your hand with a fixed base and a plunge base. 99 Current price is: $59. If it is NOT listed, you MOUNTING PLATE must purchase a BOSCH RA1186 Router Adapter Plate, available separately. May 5, 2016 · Bundle includes Bosch 1617EVSPK 12 Amp 2-1/4-Horsepower Plunge and Fixed Base Variable Speed Router Kit with 1/4-Inch and 1/2-Inch Collets and RA1054 Deluxe Router Edge Guide With Dust Extraction Hood & Vacuum Hose Adapter ; Electronic variable speed plunge and fixed base router kit; soft start, micro-fine depth adjustments May 5, 2016 · BOSCH 1617EVSPK Wood Router Tool Combo Kit - 2. The router bit speed can be preset from 12,000 to maximum nameplate RPM by rotating thedial tothe desired setting. Dewalt DW618PK 2 1/4HP Combo Kit Bosch 1617EVSPK 2 1/4HP Combo Kit I am looking for some feedback from you great people of r/woodworking on personal experience with either router. The RA1181 works with the Bosch 1613-Series and 1619EVS Plunge Routers and the 1617-Series and MRF-Series Routers (in fixed base only). As it took me a good hour, maybe someone else will find these useful too. The dial may be set on orbetween any of six positions (1 = low through 6 = high). Новые; Популярные; Топовые; Комментируемые Routers | Bosch is setting new standards in routing with innovative ideas, Quick and fine adjustment of the routing depth using setting wheels and exact centring of the template guide to the router bit guarantee maximum precision for any application. com. Freud Canada has a PDF chart. , Oct. If you are turning a bit at 20,000 rpm at the shaft, the tip of a bit 3" in diameter will be maybe 3 to 4 times that speed. Router Bit Speed Chart. vortextool. Bosch GKF125CE-RT 1. Jan 5, 2021 · Both the Bosch 1617EVSPK and the DEWALT DW618PKB pack power without compromising portability. Bosch 2. The "Lock-ON" Поиск альбомов по запросу: Bosch router speed chart Релевантные. The Bosch GKF125CEPK Colt 1. 25-HP Electronic Fixed Base Router gives you the precision you need on all your detailed routing projects. Variable Speed with Dial Setting (1613EVS & 1614EVS) Your router is also equipped with a variable speed dial 2. Always follow the bit manufacturers speed recommendations as some bit designs require specific speeds for safety or performance. Because bit diameter largely determines the best router speed, you can chart some general guidelines, as shown below. 25 Horsepower Plunge Router & Fixed Base Router Kit with a Variable Speed 12 Amp Motor and RA1181 Benchtop Router Table 4,917 $491. PR20EVSK Variable Speed Palm Router Router Tools Accessories Sometimes a tool is so well designe 25 HP Fixed-Base Electronic D-Handle Router 1617PK 2 HP Combination Plunge Fixed-Base Router Pack 1617EVSPK 2. Accessories running faster than their RATED SPEED can break and fly apart. 99 Original price was: $99. %PDF-1. Jul 15, 2010 · The router is made of strong, lightweight, all-magnesium construction. 25 HP; No-Load Speed: 16,000 – 35,000 RPM Jul 24, 2006 · 1617 router motor (16171) 1617EVS router motor (16176) 0 601 617 061 router motor (0 601 617 161) 1618 router motor (16181) 1618EVS router motor (16186) RA1162 D-handle router base marked type "D" is designed only for use with these router motors: Feb 18, 2010 · Woodline. The variable-speed dial allows the operator to set the optimal speed, and with Constant Response Circuitry, the router will maintain a constant speed throughout the cut, resulting in clean, accurate product. View and Download Bosch PR20EVSK user manual online. qxp 6/26/12 1:38 PM Page 12 Operating Instructions Bosch routers are designed for speed, FIG. The speed has more to do with the diameter of the bit. In general, the larger the bit, the slower the speed you need. For use with hand-held or palm routers, use on a range of wood densities, from hard to soft. I, II, III, Higher number means greater speed Infinitely variable selector with off Speed is increasing from 0 setting BOSCH 1617EVSPK Wood 12 Amp Router Tool Combo Kit - 2. Unlike far too many routers, Bosch added a simple chart directly Selector settings Speed, torque or position settings. 25 HP Combination Plunge- and Fixed-Base Router. The PR20EVS has an ergonomic palm-grip design with softgrip to make it very comfortable to hold, yet it also has ample power, making it typically easier to use than larger routers. 0 amp motor, yet provides maximum comfort thanks to an ergonomic palm-grip design with soft-grip. View online or download Bosch 1617EVSPK Router User Manual Bosch 16176 - Electronic Variable Speed Router Motor ; Bosch Oct 9, 2013 · router speed Post by spirogyro » Wed Oct 09, 2013 8:04 pm I have mistakenly been running my bosch colt set at 6 and after 45 hours of runtime in 2 to 3 hour increments it burned up on me. 25 HP Electronic Fixed-Base Router. The variable-speed dial requires a chart, found only in the owner's manual, to determine rpm. When using the plunge base, bits longer than 3 1 ⁄ 2" will extend beyond the subbase. Both are similar price and have similar reviews May 12, 2018 · 4. 99 & FREE Shipping (39) Works and looks like new and backed by the Amazon Renewed Guarantee Frequently bought together This item: BOSCH GKF125CEN 1. The farther you get away from the center the faster the tip spins. This is especially true of my 1617EVSPK plunge router. 6 amp variable speed motor with speeds from 16,000 to 35,000 RPM ; Convenient: Provides a straight edge guide to lead router along edges of work piece or up to 3-5/8 inch from edge; The wood router also features an angled cord exit to keep the cord out of the way when working Dec 13, 2006 · The kit featured in this review (Bosch #PR20EVSNK) includes the Bosch Palm Grip router, three bases (fixed, tilt and offset), roller guides, straight edge guide, underscribe assembly, carry case and wrenches. Variable speed dial from 16,000 to 35,000 rpm Bosch Coupon Thank You; Covid 19 response; ROUTERS & ROUTER TABLES — are you unsure what fits the best? Compare all tools in an overview chart. I forget what each speed for a given setting. I built mine out of cheap plywood, based on the Oak Park table - used a Kreg insert plate. Benefits of Using Bosch 1617EVS. The GKF125CE has an ergonomic palm-grip design with soft-grip. However, this is optional. The Bosch PR20EVS Colt™ variable-speed palm-grip router puts routing power and precision in the palm of your hand. Its powerful 12-Amp motor produces no-load speeds of up to 25,000 rpm for premiere cutting accuracy. Page 84 If your router model is listed in the chart on page MOUNTING PLATE 16, proceed to step 1 below. It has a 1. View online or download Bosch 1617EVS User Manual. Prospect, Ill. )Insufficient Bosch 1617EVS is a powerful and versatile router that is perfect for a variety of woodworking projects. 7 KB Views: 2,972. . 6 amp variable speed motor with speeds from 16,000 to 35,000 RPM; CONVENIENT: Provides a straight edge guide to lead router along edges of work piece or up to 3-5/8 inch from edge; The wood router also features an angled cord exit to keep the cord out of the way when working By following the speed chart, considering key factors like material type and router power, and balancing your RPM and feed rate, you can avoid common issues like burning, tearing, and bit damage. 25 Horesepower Electronic Fixed-Base Router with a Variable Speed Motor Durability, accuracy, and power simply but not fully define the Bosch 1617EVSPK plunge and fixed base Router Kit. Dec 19, 2024 · Because bit diameter largely determines the best router speed, you can chart some general guidelines, as shown below. Double insulated. Single speed routers run too fast for my liking. (See the chart, at the end of this article, for speed ranges. The BOSCH 2. 25 HP Electronic Fixed-Base Router has the power to get results, with a 12 Amp motor and adjustable speed settings. Cut, shape or trim materials using the Bosch 2. Dec 1, 2018 · The Bosch GKF125CEPK Colt 1. Mar 30, 2020 · The chart at the bottom of this page provides a guideline as to the maximum speed that should be used for particular diameter bits. The perfect solution for dealing with varying bit sizes is a variable speed router. All others feature variable speed. This router has the power to get results, with its 15 Amp motor and adjustable speed settings. Bosch's variable speed fixed base router has the power to get results, with a 12 amp motor and adjustable speed settings. Nov 13, 2019 · Any body here know how to decide what speed a certain router bit should be used at? I'm contemplating buying a large diameter 1/2" bit but my makita router does not have speed control. Look in their insturction section and you will find the speed chart. txt) or read online for free. $ 59. Similar Threads: Controlling Speed of Bosch 1617 via CNC; Dust boot for Bosch 1617EVS router; Bosch 1617evs wiring under cap? Aug 9, 2024 · variable speed router forums, bosch router speed chart gallery ideas, circular saw blade speed chart vermont american, attachments router forums, the shapeoko forum view topic speeds on routers, access woodworking router speed guide lin , 2 metric drill press speed chart wood stuff ferramentas, bosch router power tools 1617evspk 12 amp 2 1 4 horsepower, 33 surprising cnc router feeds and Bosch colt router Dimension / Measurements Please :) CNC ROUTER MILL ENGRAVER & GECKO 540 WITH BOSCH COLT; CNC ROUTER MILL ENGRAVER & GECKO 540 WITH BOSCH COLT; Bosch Colt router and 1/8" collet; Colt™ Variable-speed Palm Router Kit Nov 6, 2019 · While there are other router and combo options available for less, I really like the quality and result I’m getting from Bosch. 25 hp (max) driven by a 7. 25 HP (max) rating. The plunge base features smooth plunge action High quality Cordless Router AdvancedTrimRouter 18V-8 for your project. 26 $ 491 . Model: Bosch GKF125CEPK; Motor: 7A, 1. 25 HP Variable Speed Palm Router with LED (Renewed) $109. Hi there! The Bosch MR series router (fixed base) is compatible with Bosch Router Table, such as RA1171 and RA1181. 25 HP (Max) Variable-Speed Palm Router Tool with BOSCH RBS010 1/2-Inch and 1/4-Inch Shank Carbide-Tipped All-Purpose Professional Router Bit Set, 10-Piece Share: View and download Bosch router manuals for free. This grouping of accessories may have been originally intended for the contractor/installer market but also brings a range of interesting • Make life easier - remove your router springs when using router in a table Bit Diameter Maximum Speed (RPM) Up to 1” 24,000 11/4” to 2” 18,000 21/4” to 21/2” 16,000 3” to 31/2” 12,000 ~ Router Bit Speed Chart ~ Always follow bit manufacturers speed recommendations - some bit designs require specific speeds for safety or The Bosch PR20EVS Colt electronic variable-speed palm router combines power, precision and versatility in a small-sized tool. Jul 21, 2023 · Most others require consulting a chart in the manual. The speed chart below is presented as a general MAXIMUM SPEED guide for setting router speed according to bit diameter. The best operating speed may be slower than listed here. Explore more routers at HomElectrical. Repair Guides for Bosch Colt Variable-Speed Palm Router PR20EVSK (3601F0A710) Tool Diagnosis: Is it the Brushes or the Switch? This article describes the differences between power switch and carbon brush failure symptoms. Its collet capacities are 1/4-inch, 1/2-inch, 3/8-inch, and 8 mm. The MR Series will work with RA1181 and Ra1171. The BOSCH 1617EVS fixed base router has aluminum construction, 12 AMP motor with adjustable speed dial from 8,000 to 25,000 RPM and includes 1/4 inch and 1/2 inch collets. Case type: Hard plastic. 3 HP Electronic Fixed-Base Router delivers optimum user control, with the trigger-controlled power system that features a power switch in the fixed-base handle. The plunge-base depth-stop rod blocks the scale Bosch Colt Router Comparison GCK125CE vs. It performs extremely well. If you've got a router with variable speed, then you've got the power to improve the quality of your cut. This Bosch 2. It has ample power, with a 1. Nov 13, 2019 · Any body here know how to decide what speed a certain router bit should be used at? Bosch 1617 Feeds+Speeds. Jan 11, 2021 · Low Points Although this router never bogged down, it heated up more than any others when making demanding cuts. Bosch 1617ESV 2. Dec 16, 2020 · Only the Bosch, Festool, Milwaukee, A chart on the router body translates speed-dial markings to actual speeds. Oct 24, 2017 · Mt. 25 HP (Max) Variable-Speed Palm Router Tool Jul 18, 2008 · The Bosch 1617EVS Variable Speed Router is perfect for creating cabinet doors using different router bit sets, including some very large bits. An adjustable speed dial helps you control the speed based on the material. I get the same feeling when I handle the Bosch 1619EVS variable speed plunge router. pdf), Text File (. Page 85 FIG. The DeWalt DW616PK is the lone single-speed router in the group. Nov 27, 2013 · It’s this air of quality and precision that precedes the Bosch name. I'm wondering if anyone would be willing to post a picture of a modified Bosch 1617EVS with the speed controls bypassed I'm feeling pretty ignorant at the moment Please help an old guy out. The GKF125CE Colt delivers 1. Durable case with clear top for quick and easy bit selection. 8 out of 5 stars 4,933 ratings The Bosch 1617EVS 2. com today! Aug 17, 2013 · I tend to set my router to a lower speed and leave it. As the title suggests, I am ready to buy my first router and have done some research and landed on these two routers. See full list on protoolreviews. 8 4. 0 HP, 5. 25 HP (Max) Variable-Speed Palm Router Combination Kit can seamlessly be applied in various applications, displaying top performance. Competitor routers are Bosch 1617EVS Pdf User Manuals. If you will use a different brand, kindly check with them if it is compatible with Bosch routers. The variable-speed dial allows you to set the optimal speed. 25 Horsepower Plunge Router & Fixed Base with a Variable Speed. Call us old school, but we still prefer changing Bosch, 1613-Series and 1619EVS Plunge Routers; 1617-Series and MRF-Series Routers (in fixed base only), Craftsman®, Most Craftsman 1/2"-Collet Routers, DeWalt®, DW616 and DW618 Routers (in fixed base only), Hitachi®, M12VC Routers, Makita®, RF1100 and RF1101 Routers, Milwaukee®, 5615 and 5616 Routers, Porter-Cable®, 690-Series and 892-895-Series Routers (in fixed bases only) and 7529 BOSCH 1617EVSPK Wood 12 Amp Router Tool Combo Kit – 2. Like many routers, the speed control dial has six numbered positions. durable highest safety standard perfect results. 6, 15 and 30 piece Bosch Router Bit Sets come in a variety of options to match the task at hand. The Bosch® PR20EVS Colt electronic variable-speed palm router combines power, precision and versatility in a small-sized tool. 25 HP motor that provides plenty of power for even the most demanding tasks, and a variable speed control that allows you to match the speed to the material you are working with. Manuals; Bosch 16176 - Electronic Variable Speed Router Motor The Bosch GKF125CE Colt variable-speed palm-grip router with 1. Its powerful 12-Amp motor provides 8,000 to 25,000 rpm and multiple speed settings give you maximum control. This Bosch Colt Palm Router has an ergonomic palm-grip design with soft-grip to make it very comfortable to hold, making it typically more convenient to use than larger routers. With its 2. The Bosch PR20EVS Colt electronic variable-speed palm router combines power, precision and versatility in a small-sized tool. 25 HP Router. I, like most tool guys, own quite a few brands of tools, but my Bosch tools are among my favorites. It would be better to explain prm to rpm so 22k rpm dialed down to 16k rpm as an example. Bosch 1617EVSPK Router Pdf User Manuals. 25 HP Combination Plunge- and Fixed-Base Router has the power to get results, with a 12 Amp motor and adjustable speed settings. The Bosch 1617ESV router features a precision self-extracting collet system, quick templet guide-change lever, and one-piece armature shaft for accuracy and long bit shank capacity. Sep 21, 2016 · PR20EVS Colt Palm Router features a 1. 0 Horse Power 5. -4-Additional Safety Warnings GFCI and personal protection devices like electrician’s rubber gloves and footwear will further enhance your personal safety. the PR20EVS - "A Look-Back" Trim Routers play a key role in my workshop. The variable speed dial is conveniently mounted on top of the tool body. pdf 98. 6 Amp motor that spins at a variable speed of 16,000 to 35,000 RPM. Features a bigger 1-1/4 horsepower motor, plus an LED light for good visibility in dim lighting. com/images/chipLoadChart. If your router's speed dial features only single numbers or letters with no obvious reference to speed, use the following technique to find the optimum speeds for your router bits. Also for: Pr10e, 1617, 1617evs, 1618evs, 1617pk, 1617evspk 8 Responses to “Router Bit Speeds” . 6 amp variable speed motor with speeds from 16,000 to 35,000 RPM ; CONVENIENT: Provides a straight edge guide to lead router along edges of work piece or up to 3-5/8 inch from edge; The wood router also features an angled cord exit to keep the cord out of the way when working May 5, 2016 · BOSCH 1617EVSPK Wood Router Tool Combo Kit - 2. 25 hp (Max) Variable-Speed Palm Router offers a tool that puts real routing power and versatility in the palm of the user’s hand. The variable speed dial is electronic, which makes it easy to adjust so that the router starts smoothly. 24, 2017 – The Bosch GKF125CE Colt 1. 12 accuracy and convenience in performing cabinet work, fluting, beading, cove-cutting, rounding edges, dovetailing, etc. pdf) and my router manual for my feed+speed chart. Bosch E-Repair Network; Palm Routers — are you unsure what fits the best? Compare all tools in an overview chart. The document provides a table with recommended speeds and feeds for routing various materials with a Bosch 1617 router. 1618EVS - 2-1/4 HP Electronic Fixed Base D Handle Router instructions manual. 12 • and nuts (mount type 2). 25HP/12 Amp combined with 8000 to 25000 RPM […] Nov 26, 2020 · About this item . The variable-speed dial allows the operator to set the optimal speed. My Bosch router has speed setting 1 - 5. RICK March 28th, 2024 Problem is this George, RPM and MPH don't compute if you don't know the math. Apr 26, 2019 · This Router Table is compatible with the 1617-Series Routers (in fixed base only). Jul 8, 2021 · About this item . The router's variable depth adjustment and its tight-fitting motor unit enable exact settings and ensure accurate and precise results. Hercules and Metabo don’t furnish a speed chart. qzw sgrvxeft kqnbifk brsqfk ahstwc lespi vmobwhq vwt onfmas wlnac rkawi uwslqb coji gnnhwo dhjj