A recent online auction netted me a box of K20 soft fire bricks for CA$25. The photo showed maybe 5 or so bricks but in reality the box had 20 bricks, 2 of which already had heating elements!
After many hours of using the lathe, it was time to finally get rid of changing belts and install a variable speed motor. Trolling Kijiji resulted in purchasing a 2.5HP 130VDC treadmill motor.
The result, variable speed and much better finish since I can now set the speed I need instead of making do. Switching between HSS and insert tooling no longer requires getting out the 14mm wrench 🙂
I am in process of building a Jan Ridders Glass Cylinder engine and it requires T2.5 timing pulleys. I am not fond of spending money (it is a hereditary thing I think) so I intend to make my own pulleys. Originally I was going to use the fly cutter technique but with the tiny tip size I am concerned that the tool will not last cutting 3 pulleys. Continue reading
The next few parts on the Glass Engine are brass. For that I need to grind some cutting tools, the geometry for brass cutting is quite different. While I have a Quick Change Toolpost, every cutter more or less needs its own holder. This gets pricey at CA$20 each. Plus the growing collection needs a storage solution.
On YouTube I had seen an interesting solution while browsing for tool grinder videos. Luis Ally uses round tool bits for his machining. Well worth a watch. Basically you make a holder for round tool steel, and replace the ‘inserts’ as needed. Since I have a Tool & Cutter Grinder and I have 6 and 8mm round tool steel, it was just the solution.
I used some .5” square stock, drilled a 5.5mm hole and reamed it out to 6mm. Then using a slitting saw I cut a groove on one side. This allows the clamping force of the tightening screws to lock the tool bit in place.
The work head on my antique grinder is in need of some remedial work. When I measure the run-out (wobble) it is 0.006”. Might not seem like much but when you need to grind a shaft down to some size it would be great if the result were actually round!