My Harrison Lathe.....Restoration??

The Shop > Tools

<< < (6/8) > >>

Darren:
Ah, that prob explains why my last S&B belt didn't last too long then? I have it fairly tight, the new one is not leather though.

Just to clarify a couple of points as it may help decisions, though really I would doubt it. The lathe cones don't seems to be curved like my S&B, they are flat. Sizes for both are 2,3 & 4". The lathe uses a combination of bronze bearing at the back and ball race at the front. So I guess still need to keep the speed down.

With a 400rpm layshaft speeds would be 800, 400, 200, with back gears 112, 56, & 28 rpm
Quite a nice range I would think?
I don't really need high speed from this machine as the S&B goes up to 3,000 rpm and I would use that mainly for small dia work, esp with the collets. Then there is the Mini Lathe.
Feel like a spoilt brat ere ::)

I have two motors with gearboxes on them. So thinking that I could do away with the layshaft and fix the 3 step pulley directly on the motor I investigated further.

One has a 15/1 ratio, so speeds would be 190, 95, 47, 26.6, 13.3, & a whopping 0.07 rpm. A bit slow methinks :smart:

t'other is on the donkey saw, 28O rpm giving 560, 280, 140, 78.4, 39.2 & 19.6 rpm. Apart from the top being a bit low at 560 that's not too bad is it.
I could almost live with that.

Comments anyone?

Darren

Darren:
Thinking things over how about this basic idea.

Shorter belt req', mount on steel plate, wood for mock testing. Mount roughly as shown in the picture, both layshaft and motor have adjustment in feet for tension and alignment.The red line relates to a pivot point with the bias position to drop the layshaft under gravitational forces onto simple bolt/nut. The bolt being fitted vertically from the table lower section for the board to rest upon thereby adjusting belt tension.

All to be sited under the table with the lathe above.

CrewCab:
Darren .......... that's pretty much how the Underdrive system works on my Boxford Lathe ............ and there are thousands of them out there working fine ........ so the system is tried and tested, OK there are a few extra pulley's so variable speed is an option but ......... you can always add that later. I'm sure there is a wealth of info on't interweb, but ...... if you want a couple of photo's just shout up :wave:

CC

Darren:
Thanks, I think I'm pretty much sorted, but a pic never hurts does it, just in case :wave:

Darren

Brass_Machine:
Thanks Darren :wack:

Now I am on the lookout for an old lathe to restore. Not like I have enough projects and ideas to sort through :)

J/K around of course. Between you and Rog restoring old machines to better than new... I got the itch!

Eric

Navigation

 Message Index

Go to full version