Knurling Tool Improvement

**Paul Jones** · May 6, 2015, 09:09 PM

I extended the height of the knurling adjustment nut on my scissor-type clamp-on knurling tool to provide more clearance between the adjustment nut and the QCTP tool holder. The new extension includes a 3/8” thick knurled ring for quick adjustments and a hex-end for adjusting the knurling depth.

The extension was made from 12L14 hexagonal steel rod and turned down to 0.600” dia., internally threaded 3/8-16 x 0.88, and then drilled from the other to 25/64” dia. providing thread clearance. The 0.600 dia. section has a slight 0.002” taper to allow easier sliding of the 0.5995” ID knurled ring into position and then pressing fitting into final position.

**kbalch** · May 7, 2015, 11:12 AM

Thanks Paul! I've added your Knurling Tool Improvement to our Lathe Accessories category, as well as to your builder page: Paul Jones' Homemade Tools.

**DIYer** · May 7, 2015, 06:13 PM

Nice mod on an already well-made tool.

**Catfish** · May 12, 2015, 08:32 AM

Paul, Nice job and great idea.

Randy

**Paul Jones** · May 14, 2015, 04:37 PM

Thanks Randy.

Most of my knurling is performed very close to the spinning chuck. The original knurling tool adjustment nut barely cleared the knurled height adjuster for the QCTP. Even worst was the possibility of accidentally hitting the spinning chuck when using even a short crescent wrench (~4") to adjust the knurling pressure. That is why I made the knurl adjustment extension extra long so there was no way to swing the wrench around and hit the spinning chuck. In most cases I do not use the wrench anymore because the knurled height adjuster can be tightened by hand and provides just the right pressure for superior formation of knurls on 303 stainless steel (for example see http://www.homemadetools.net/forum/s...3072#post77395 ).

Regards, Paul Jones