Uploaded July 2016 | Updated September 2026, 1 week ago
Here I blend the edges of all the carbide gage pins and lap a 0.4" spherical radius on the 1/16" diameter pins. Machining of all the jaw pieces that will get silver soldered to the calipers. Making grinding wheel flanges using a interesting chuck stop system. And mounting a .020" thick grinding wheel.
Paypal donation paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W64WRAAGMA79J&source=url
Support through Patreon patreon.com/ROBRENZ
I am "robinrenzetti" Instagram lots more content there!
Great video synopsis by brs_workshop
"Shop Notes"*
• Overview of steps in this video.
• Radiusing the pins
• Lapping the spherical ends in the lathe with a die grinder adapted to quick-change toolpost. Hollow cylindrical lap at an angle.
• Flex-shaft rotary grinder 22K RPM*:
Not a Dremel, not a Foredom, not a DuMore(money),
It's an inexpensive import from a company you've never heard of: SE.
American Science & Surplus (all around cool company, different handpiece): sciplus.com/p/VARIABLE-SPEED-FLEX-SHAFT-GRINDER_43486
Amazon (different handpiece): amazon.com/SE-979FSG-Flexible-Grinder-Switch/dp/B000NW4YRK
Amazon (just the handpiece):amazon.com/Handpiece-No-28-Tapered-32in-Collets/dp/B000WTM200/ref=sr_1_13?ie=UTF8&qid=1507724502&sr=8-13&keywords=foredom+handpiece
*Note that the similar looking tool sold by Harbor Freight only goes to 15K, which is ~68% of the SE.
• Review of the drawings for the jaws
• Machining the jaws.
• Rob shows his sets of thin parallels including a set of wavy ones.
• Loctite 380 (BlackMax):
KBC Tool: kbctools.com/products/FLUIDS/ADHESIVES/ADHESIVES%20@@26%20EPOXY/4098.aspx
McMasterCarr: mcmaster.com/#loctite-380/=19rh7aq
Amazon (tube 0.1 oz): amazon.com/Adhesive-Instant-Black-Loctite-Corporation/dp/B000132VKI
(bottle 1.0 oz): amazon.com/Loctite-135423-Toughened-Instant-Adhesive/dp/B000132VEE
Loctite website: na.henkel-adhesives.com/product-search-1554.htm?nodeid=8797890609153&msdsLanguage=EN_US&selectedTab=technical
• Drilling and tapping the jaws.
• Cool-Tool 2 + Tetrahedral Boron Nitride
Unfortunately, Cool Tool 2 can't be sold in California. McMasterCarr: mcmaster.com/#cool-tool-ii-cutting-fluids/=19perdz Source of tetrahedral Boron Nitride powder. amazon.com/Boron-Nitride-BN-Powder-Purity/dp/B015ENSWHA/ref=sr_1_2?ie=UTF8&qid=1507723551&sr=8-2&keywords=zyp+boron+nitride
• Grinding down a woodruff cutter to make a slitting saw. Using a cut-off disc to slot the flexure in the jaws.
• Making support flanges for a cut-off wheel mounted in a surface grinder.
• We get a peak at the chuck backstop system that has since become very popular.
• Good tip about creating a dish when edge-holding in the chuck.
• Norton Cut-off wheels:
MSC might have the right one: mscdirect.com/product/details/01833508
Obviously you need to size appropriately for your machine.
*Not affiliated with any manufacturer or distributor.
Here I blend the edges of all the carbide gage pins and lap a 0.4" spherical radius on the 1/16" diameter pins. Machining of all the jaw pieces that will get silver soldered to the calipers. Making grinding wheel flanges using a interesting chuck stop system. And mounting a .020" thick grinding wheel.
Paypal donation paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W64WRAAGMA79J&source=url
Support through Patreon patreon.com/ROBRENZ
I am "robinrenzetti" Instagram lots more content there!
Great video synopsis by brs_workshop
"Shop Notes"*
• Overview of steps in this video.
• Radiusing the pins
• Lapping the spherical ends in the lathe with a die grinder adapted to quick-change toolpost. Hollow cylindrical lap at an angle.
• Flex-shaft rotary grinder 22K RPM*:
Not a Dremel, not a Foredom, not a DuMore(money),
It's an inexpensive import from a company you've never heard of: SE.
American Science & Surplus (all around cool company, different handpiece): sciplus.com/p/VARIABLE-SPEED-FLEX-SHAFT-GRINDER_43486
Amazon (different handpiece): amazon.com/SE-979FSG-Flexible-Grinder-Switch/dp/B000NW4YRK
Amazon (just the handpiece):amazon.com/Handpiece-No-28-Tapered-32in-Collets/dp/B000WTM200/ref=sr_1_13?ie=UTF8&qid=1507724502&sr=8-13&keywords=foredom+handpiece
*Note that the similar looking tool sold by Harbor Freight only goes to 15K, which is ~68% of the SE.
• Review of the drawings for the jaws
• Machining the jaws.
• Rob shows his sets of thin parallels including a set of wavy ones.
• Loctite 380 (BlackMax):
KBC Tool: kbctools.com/products/FLUIDS/ADHESIVES/ADHESIVES%20@@26%20EPOXY/4098.aspx
McMasterCarr: mcmaster.com/#loctite-380/=19rh7aq
Amazon (tube 0.1 oz): amazon.com/Adhesive-Instant-Black-Loctite-Corporation/dp/B000132VKI
(bottle 1.0 oz): amazon.com/Loctite-135423-Toughened-Instant-Adhesive/dp/B000132VEE
Loctite website: na.henkel-adhesives.com/product-search-1554.htm?nodeid=8797890609153&msdsLanguage=EN_US&selectedTab=technical
• Drilling and tapping the jaws.
• Cool-Tool 2 + Tetrahedral Boron Nitride
Unfortunately, Cool Tool 2 can't be sold in California. McMasterCarr: mcmaster.com/#cool-tool-ii-cutting-fluids/=19perdz Source of tetrahedral Boron Nitride powder. amazon.com/Boron-Nitride-BN-Powder-Purity/dp/B015ENSWHA/ref=sr_1_2?ie=UTF8&qid=1507723551&sr=8-2&keywords=zyp+boron+nitride
• Grinding down a woodruff cutter to make a slitting saw. Using a cut-off disc to slot the flexure in the jaws.
• Making support flanges for a cut-off wheel mounted in a surface grinder.
• We get a peak at the chuck backstop system that has since become very popular.
• Good tip about creating a dish when edge-holding in the chuck.
• Norton Cut-off wheels:
MSC might have the right one: mscdirect.com/product/details/01833508
Obviously you need to size appropriately for your machine.
*Not affiliated with any manufacturer or distributor.
