Today I made two sets of Lathe Donuts!
First bolt a 6 x 6.75 x 1 1018 steel plate down to the mill table (MDF under)
Then grab a 1/4 inch x 1 inch DOC, solid carbide router bit
Then start cutting, 0.062 DOC, 1800 RPM, 5 IPM (have to go slow because the tool is so spindly), Kerosene for cutting oil because that's what I had in the tank.
Let run for about 2.5 hrs while I work on my corner smoothing software mods for my router and clean the shop.
The corner smoothing software mod worked perfectly, and I vacuumed up 55 gal of plastic chips.
The tool bit is 0.248, and the parts are laid out 0.270 apart.
And milling is finished
Next over to the lathe and drill 15/16 and bore to 1.002. Dial everything in on the first part, then ''trust the dials''. I have no idea how accurate the cross slide screw is, but it's very repeatable and in this case, that's all I care about. Drill hole, dial to 0.010, make a pass. Dial to 0, make a another pass, reverse the carriage drive, and run the spring pass on the way out, and done. I normally would have used a shorter boring bar, but that's what was in the holder.
And here they are. They still need set screws, but it's getting late and I'm tired. Time to quit for the day before I do something stupid.
There is always tomorrow!
These are used on glass blowing lathes. Here's a pic I grabbed off of the net. The ones shown in the pic are are round, but the ones I made have a 120° angle machined on them so they will close down to about 3/16. Those are 3 jaw, glass blowing, scroll chucks, both the headstock and tailstock are powered. A little different that what we normally see.
