How To Grind A Lathe Parting Tool

Video on how to properly sharpen and use HSS parting blades. For our second project we were given two new 38 lathe bits and had to learn to grind a turning tool parting tool facing tool and a threading tool for 34-10 ANS threads. Turn the parting tool over and do the opposite side for the same amount of time.

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Turn the grinder on and lower the tip of the parting tool onto the moving grinding wheel for a few seconds.

How to grind a lathe parting tool. I intend mostly to use them for roughing and for preliminary grinding of reliefs on drills. To use the blade needs grinding back on the top surface for as long as you desire in front of the clamping area removing the top surface to below the bevel. So all you have you to do is set your tool rest on the grinder up for a 50 degree angle grind.

1 Its difficult to sharpen the bevels of a parting tool and arrive at the correct side profile with the ears leading the nose. Another thought on parting is to try to do your parting as close to the chuck jaws as possible. I shaped the end of the blade like the Sorby Parting Tool double angle look.

Even so this little tool is tempting because grinding a parting tool from a tool blank is a pain - since so much metal must be ground away - and parting tools get dull and break easily. The parting tool has an angle of around 50 degrees. Grinding down too far will have the effect of reducing the blade width and so limits the depth the tool can be plunged.

Secure and dress the wheel Make sure your bench grinder is fastened securely to the floor with no wobble or give. Ad Easy to Use - Laser Fits in Spindle 4-Axis 00002 resolutn Fast Setup. Parting tools are used for parting through spindle stock and several other operations.

My most immediate need is to grind a single point cutter for ACME threads. You can apply a degree of back rake at the same time too if you desire. Position the tool rest 10 from horizontal to grind an 80º bevel on the blade.

You can use whatever back rake you like if you achieve it by angling the entire blade like the Aloris holder. If youve used the bench grinder recently youll want to dress it removing the old bits of debris caught in the stone. Im assuming youre talking about your average HSS parting blade including P-type If you grind the top of the blade the tip becomes lower than the original top.