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tlfamm
03-03-2015, 07:09 PM
Found on YouTube: one man's shop-built lathe brake. The current design doesn't allow for adjustments to drive-belt tension; also I think I'd prefer a foot-actuated device.


In three segments:

https://www.youtube.com/watch?v=1Kj8mwyeU1Q

https://www.youtube.com/watch?v=sfYrdg-wp3M

https://www.youtube.com/watch?v=CLQXML8hEtY

vpt
03-03-2015, 07:26 PM
Good post!

I wouldn't put one on my atlas with the threaded chuck but any other type I would be all for it. I would want to use a hydro unit just to be cool though. :D

CalM
03-04-2015, 08:58 AM
With the general availability and small expense of VFD's, mechanical brakes have lost some interest to myself. (if needed to be purchased, bicycle brake components can add up)

The VFD offers programable stop rates/times and profiles etc as a freebe to accompany the variable speed capability.

IanParkin
03-04-2015, 09:26 AM
I did almost the same job on a colchester student
written up here
http://www.model-engineer.co.uk/forums/postings.asp?th=99645

But I made the disc and used a control directly on the caliper
colchesters with a clutch dont have a brake as standard and VFD's dont help as motor keeps running when spindle stopped

ldbent
03-04-2015, 09:49 AM
VFD's aren't exactly free. Adding the braking resistors and heat sinks may not be easy. I have a 16 inch--1800rpm lathe with a foot brake. The brake is a band of friction material that wraps around a drum. When the brake is stepped on drive motor is turned off and the band is tightened around the drums external diameter. It looks very simple but I'm sure the devil is in the details and required some engineering and trial and error. I have not turned anything heavier than 25# but even with the 12" 4 jaw it takes very little effort to stop the spindle. It is easy to modulate the braking force as it is much like driving a car at low speed.