Search found 258 matches
- Tue Jan 28, 2020 11:13 am
- Forum: Lathes
- Topic: Change lead screw to metric?
- Replies: 29
- Views: 10280
I had to make a new lead screw for the compound after a crash. I ground an 29 degree acme cutter, when I check the fit on the bent screw it didn't match. Hum. Did some research and found there was a 30 degree metric version of acme. Ground that and it matched. The new screw fit the nuts perfect.
I have a 16 x 80 lathe imported from Poland by Summit Machine Tools. It has inch pitch lead screws that are metric diameter and trapezoidal metric thread form.
- Tue Apr 09, 2019 10:31 pm
- Forum: General Discussion
- Topic: Measuring a diameter without a caliper
- Replies: 19
- Views: 7466
Marv is right, I have a PI tape that uses a vernier to read to 3 decimals. But it assumes the part is round and gives the average dia. The tape measures that crank into a housing are flat, ie no form to keep them straight so they will wrap around a cylinder. Think they're only divided in 1/8ths thou...
- Mon Nov 12, 2018 11:17 pm
- Forum: Milling Machines
- Topic: Cinti ToolMaster 1D variable speed pulley & motor shaft ?
- Replies: 18
- Views: 8657
Harolds idea is quite feasible, I made a smaller one for the variable drive on an old Delta scroll saw. Tried to post a picture but forgot how. Made it up with a plate and shaft weldament. There are two part putties that you need then cure with heat from a light bulb. High heat resistance and tough,...
You mentioned cutting the worm on a lathe. My Summit will cut 1/4 tpi, 4 inch pitch, slowest speed 20 rpm would give a carriage speed of 1 1/3 inches per second. I've never used that setting. Would you use a single point cutter or some sort of milling attachment. Square thread form is the only thing...
- Tue May 29, 2018 5:55 pm
- Forum: General Discussion
- Topic: First cut with a shaper
- Replies: 11
- Views: 3346
I agree with Harold on using HSS but I've had good results with brazed carbide cutters on large cast iron parts where the HSS would dull before finishing the face.
I produced a lot of odd parts on an 8 inch Logan. They're slow by todays standards but cheap to operate and can do some things standard machine tools can't. I added a DRO to the Logan and used it to cut 5 foot long racks for a CNC plasma table. As near as I can measure using a 24 inch dial calliper ...
The magnetic scales sold by DRO Pros seam to use a magnetic tape with an adhesive back that you bond to an aluminum extrusion. Aluminum has a high coefficient of thermal expansion, about 3 to 4 times glass depending on the material. On a 12 inch scale with a 10 deg f change, the length of the magnet...
The Hardinge HVL has a travel stop on the carriage for threading. You leave the 1/2 nuts locked. When it hits the stop the carriage stops and the cutter makes its own relief groove. A quick retract on the compound moves the tool back, you flip a leaver to reverse the carriage which stops on a back s...