Hopefuldave
Intergalactic pot-mender
- Messages
- 2,543
- Location
- The Shed of Danger, surrey, England
Back here with ideas.
Found a Facebook group entirely dedicated to homemade lathes , milling machines , shapers etc .
I've googled "homemade Norton geartrain " and found @gaz1 's thread about something like that.
Now just wondering about , I'm sure to be able to make a simple lathe without to much difficult.
Once done I think that I could be able to make something similar to a Norton box using chains and sprockets .
Using an M20 2.5mm all threads as lead screw .
The gear ratio between spindle and lead screw should be
S(spindle RPM) L (lead screw RPM)
0.75mm S 3.33 L 1
1.00mm S 2.5 L 1
1.25mm S 2.0 L 1
1.50mm S 1.6 L 1
1.75mm S 1.42 L 1
2.00mm S 1.25 L 1
2.50mm S 1 L 1
3.00mm S 1 L 0.83
3.50mm S 1 L 0.71
4.00mm S 1 L 0.62
Theorycally NPT
1/4" S 1.88 L 1
3/8" S 1.88 L 1
1/2" S 1.38 L 1
3/4" S 1.38 L 1
1" S 1.08 L 1
1"¼ S 1.08 L 1
1"½ S 1.08 L 1
2" S 1.08 L 1
2"½ S 1.08 L 1
3" S 1.08 L 1
If you arrange the gearbox so you can drive either of the shafts and the leadscrew can be powered by either shaft you can go between length/turn and turn/length (metric and imperial) with only one or two changes in the drive from the spindle -
Dave H. (the other one)