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Sharpening bits freehand for thread cutting on the lathe is always time consuming because of the frequent checks instagrxm to get the angles correct. I recently purchased "Screwcutting in the Lathe" by Martin Cleeve lathe tools sharpening jig instagram describes a simple jig for sharpening threading bits. There are only three parts plus some pins and fasteners so sharpeningg effort is modest.

As with most gadgets I build, the concept is the critical part - considerable freedom on dimensions lathe tools sharpening jig instagram affect operation. Time to sharpen or resharpen a threading bit instagrwm the jig is much reduced and the result is much more professional looking no facets as when I freehand. Sharpening is completed on the side of the grinding wheel or disk sander so the ground surfaces lathe tools sharpening jig instagram flat. After sharpening my threading bit and seeing the nice job it lathe tools sharpening jig instagram, I realized that the problem with freehand lathe tools sharpening jig instagram is the difficulty obtaining the same angle when presenting the tool to the grinding wheel after examining the results and deciding it needs "a little more taken off".

This jig makes it easy to repeat the angles so the result cuts well and is very professional looking i. This jig can also be used to sharpen bits other than threading bits.

The backplate is HRS 2. The pins are added later to facilitate setting the 10 degree relief angle. The mounting plate is 2" wide, 1. A hole is drilled and tapped in the center of the back edge to connect this plate to the backplate. The lathe tools sharpening jig instagram jkg 1.

Cleeve used steel, I used aluminum because it is easier to work and I don't expect to wear the jig out from use -- if I do then tols next block will be steel - or HDPE a good option for builders who don't have a mill. Cleeve used 3 bolts to secure the bit in the holder, I thought 2 were enough we all leave our thumbprint on our work. I set the angle of the toolblock to 60 degrees using a machinist protractor then scribed a line to allow setting the toolblock angle easily; other angles are ltahe needed Acme, Whitworth but these are infrequent in my shop so they will be set with the protractor when necessary.

To add a stop pin in the backplate, the mounting plate was tilted 10 degrees and locked with the screw. Two pins are needed, one on each side.

A guide is needed on the grinder rest, perpendicular to the side of the wheel and far enough out to allow the jig's backplate to pass so the bit can contact the side of the wheel.

When using the left side lathe tools sharpening jig instagram the wheel it may be helpful to rotate the toolholder so its slot is on the right side. Alternatively, change only the relief angle and flip the bit itself over to use the same side of the wheel. Lots of ways to use it once you have the jig in hand. The sample bit shown in the parts picture is upside down to show the ground sections better. This is the bit I originally ground freehand, then cleaned up with the jig.

It has done all my threading for 3 years and definitely needed sharpening, something I was avoiding because of the time it took the first time around. It took less than 10 minutes to resharpen it with the suarpening, most of which was learning how to use the jig and hand honing after grinding. Cleeve sharpens threading bits with the point on the left so they can thread closer to a shoulder, something I didn't think through when sharpening my first threading bit so the point on mine was centered Cleeve also recommends some side rake to improve finish and shows how to do this easily and accurately, I'll try this on the next threading bit I sharpen.

Finally, if the guide on the grinder rest is accurately perpendicular to the wheel then in use the bit can be aligned parallel to the face of the chuck -- more accurate than using a fish tail according to Cleeve. Another detail on threading bits: the tip must be flattened or rounded to produce the appropriate width for the bottom of the thread.

This is far more relief than needed, causing the tip of the tool to be weak and prone to break. The book provides information on how to make a nice boring bar type holder for inside threading and boring. I haven't made one yet but I did sharpen a regular Everede HSS insert for threading - something I had avoided for 2 years. The bit was extended from the bar while sharpening to increase clearance. This picture shows the result, with the bit set for threading.

Note how the insert is held at an angle; this angle is what prevented me from using this bar for threading prior to building Cleeve's jig. This bar uses the small HSS inserts, only thou wide. This book is well worth its modest cost if you do threading on the lathe. For safety reasons, grinding on the side of the wheel is not generally recommended with bench grinders - the wheel isn't meant for this although Cleeve shows it in his book.

I used the bench sander shown to rough the outside threading tool, then finished on the bench grinder. The outside threading tool takes a while jit grind so roughing on the side of the wheel should be avoided. Another method I use is to touch the blank to the side of the wheel to produce a small area that serves as a guide for the major grinding.

Lathe tools sharpening jig instagram then pick the jig up, match the flat to the front of the wheel and grind some off This suarpening the circumference of the wheel for the major lathe tools sharpening jig instagram of the grinding.

My internal threading bit is a tiny insert so that was done on the side of the grinder wheel in a few seconds; so little material was removed that roughing wasn't worthwhile. Resharpening threading bits with the jig is quick and removes little material because the jig reproduces the angle accurately.

However, when the side of the wheel eventually becomes loaded with metal, realize that refreshing would thin the wheel and reduce its strength, possibly making further use hazardous.

Sharpening lathe and shaper bits in the home shop is an iterative process - grind some, check progress, grind a little more, check progress, etc. When hand sharpening it is common to have the angle slightly different following each check, leading to a "faceted" tool i.

Often, when attempting to re-sharpen a bit we get the angle slightly wrong and end up having to lathe tools sharpening jig instagram more to compensate or recover. Using the jig allows setting it up by touching sjarpening to the non-moving wheel, tweaking the angle to get it just right before committing to removal of HSS. This jig can accommodate most lathe bits with only minor contortions if you use a grinder rather than the disk sander shown above -- a grinder adds some freedom by allowing use of the circumference as well as the sides see caution above of the wheel.

If the jig's mounting plate is flipped over you can scribe desired angles on it without losing the lines scribed for threading bits or simply use lathe tools sharpening jig instagram protractor.

There are two degrees of freedom: rotation on the mounting plate plus rotation of up to 10 degrees for relief. In combination with using either the sides or the outside of the wheel most desired shapes can be accurately and repeatably ground.

The key point is that, once set, the angles repeat nicely after picking the jig up to see how things are coming lathe tools sharpening jig instagram. I found the jig worked well in making dovetail cutters for my shaper. The nice part is the tools look professional no facets and they worked first time with no trial and tols or fussing to get the angles right.

Looking at these two pictures makes it jif that shafpening jig has seen some changes in the 6 months that I've been using it. Most obvious is the hole for round threading bits as used by the Retracting Toolholder ; the bore angles upward at 7 degrees to match the toolholder. And, the corners of the mounting plate have been removed to increase clearance for the grinding wheel. Not shown is a recess for the head of the bolt which holds the block to the support plate; this allows the jig to be moved through a larger angle when using the side of the wheel.

Plus, I re ground my threading tool per Cleeve's example to allow threading to a shoulder. If I were to make another jig, I'd move the block as far back on the mounting plate as lathe tools sharpening jig instagram while allowing degree rotation and I'd shorten the mounting plate to match.

Making the support plate and the toolholder narrower would improve clearance for the grinding wheel even more. These changes aren't needed for threading bits but add flexibility to accommodate sharpening other types of bits. Not the last word shatpening threading, just what works for me. Threading itself isn't difficult but it requires considerable concentration and attention to detail, especially while cutting your first few threads.

It's best to lathe tools sharpening jig instagram on some scrap until you gain confidence in the hsarpening and your ability to execute it accurately. I avoided threading for some time after getting the 7x12 then ground a threading bit by trial and error and used that until it got dull. I built Cleeve's jig to sharpen threading bits more easily a big helpadded DRO's to the lathe helpful for setting the infeed lathe tools sharpening jig instagram, and most recently built a retracting toolholder for threading to avoid winding the cross slide in and out latne each pass.

Although I still recall my first threading attempt and being doubtful the cutter would exactly retrace the thread each pass, I have now done enough threading that I am more confident it will follow the same path each time First, I try to choose a TPI divisible by 4 because it simplifies single point threading operations by allowing use of any odd number on the thread dial for lathe tools sharpening jig instagram. I have spiral point plug taps and also bottoming taps for these three sizes.

My larger taps are from a standard tap set so only plug taps are available. For the simple little items ,athe build, and cover most of my needs, making it easy to keep a selection of types and lengths of machine screws. Shar;ening found it convenient to stock longer machine screws and shorten them as needed unless a large number of screws are involved. The rough end is smoothed by applying the tool to the bench aharpening then the screw is advanced a half turn and the thin part of the thread is rounded with a small file.

The sander slowly wears the tool away but a replacement is easily made. Rools point threading on the lathe is the best choice for a number of things, especially when the thread must be concentric to the shaft it is on.

Threading with the minilathe requires: 1 installing the appropriate gears, 2 sizing the area to be threaded, and 3 the actual threading operation. There are a number of charts available providing the gear setup for metric threads but most of my threading is imperial so all the needed info is on the sticker attached to the headstock cover. I use Richard Hagenbuch's threading banjo pictured and fine feed module to minimize the effort of transitioning between modes; Richard's plans for both are available reproduced here by permission.

By choosing to use mostly 32 TPI threads, my banjo remains set up for this making switchover quick and easy. One thing that makes gear changing easier is realizing that most TPI setups only use 3 gears and thus the idler gear tooth lathe tools sharpening jig instagram is arbitrary - no need to change it unless the current idler simply won't fit - the banjo is particularly easy to adjust to handle many TPI's with the same idler.

When installing the gears ensure there is a bit of clearance - some use a strip shagpening paper in the gears to set clearance - else the gears can bind slightly which will cause lathe tools sharpening jig instagram thread to be erratic a so-called drunken thread. The gears should turn easily with no binding using the gear on the end of the leadscrew as a knob. The plastic change gears don't require lubrication making handling of the gears cleaner.

Once the change gears are set up and spin freely, you can engage them when needed lathe not spinning, of course using the handle at the rear of the headstock. The major diameter of the area lathe tools sharpening jig instagram be threaded is found in the standard charts; I use charts printed from the LMS site, the chart for imperial lists major and minor diameters while the metric chart requires some calculation.

Turn the area to be threaded down to the major diameter as provided by the chart. Use a file to chamfer the end at 45 degrees or so for about lathe tools sharpening jig instagram thread. The point should be rounded to handle the finest thread you expect to ji.

The easy way to do this is to use a commercial screw as a gauge and hone the tip of the cutter until it fits nicely the tip will likely snap off if left sharp.

Tools sharpened in the jig are aligned properly if the side of the tool blank is parallel to the chuck - so a fishtail tool isn't needed, just use Youtube Sharpening Lathe Tools Jacket a parallel laathe the face of the chuck and the cutter body. The tip of a threading tool is relatively narrow and delicate so threads are cut using multiple passes, adding a few thou of depth per pass -- this also produces a better finish on the threads.

There are two basic ways to advance the cutter when threading: feed straight in cutting on both sides of the Vor feed down the flank cutting on one side of the V.

Feeding down the flank generally instatram easier on the lathe and produces a better finish on the threads so it is almost universally used.

Our bench grinder tool rest. This jig is excellent Sharpening Lathe Tools Without Jig Review for achieving any sharpening angle you desire and tools are easy to hold on the large table, ideal for spindle gouges, skews or just general grinding/sharpening. Really solid all steel construction with a 6mm thick table platform ×70 mm. Select and adjust your sharpening angle with a 13mm. Raptor Grinding Sharpening Accessories Upgrade your sharpening system with the Raptor Grinding Jig Guide and Set Up Tools. Grinding Jig: Laser cut from 1/8" steel and built to last a lifetime, the Raptor grinding jig guide features a symmetrical design that allows for . Feb 02,  · (A larger jig to accommodate the tool holder would allow re-sharpening without removing the tool from the holder - hindsight is always 20/) Bits produced with this jig all look similar (i.e. a roughing bit looks a lot like a finishing bit) so it may be helpful to mark the bits (or their tool holder) to indicate their intended use.

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