A lay shaft reducer for the 7x14 lathe.

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modeldozer:
Good evening al modders,

The pulleys and bits finally arrived.

So I started a small production line to drill, ream and cut keyways in all the pulleys.
I used pulleys and a belt from my CNC router so I could use the lathe. At 2:1 ratio it had a lot of torque, enough to ream the holes at 50 RPM without any difficulty.

Then it was over to the mill to drill and tap some holes for grub screws.

Then disaster struck when I broke the second tap in the large pulley.

The middle size pulley had its hub removed. I could do facing cuts of 1mm at a time with no problem, something that was impossible in the past.

When I got around to remove the hub of one of the small pulleys, the lathe was striped down again, and not wanting to reassemble it, I cut it down in the mill with a fly cutter.

All done. The 2:1 ratio is a bit slow for normal use so it was set on the 1.5:1 for now.

I have not used it much yet, but between the additional head support and increased torque there is a definite improvement.

Next up is a new guard for the motor.

Cheers
Abraham

modeldozer:
Hi all,

I think I have come up with a design for the motor guard. Had a few pieces of sheet cut by a friend.

After doing some cutouts the pieces was soldered together with plumbers tin solder. Unfortunately my gas torch does not work well for doing this with silver solder.

Loosely fitted on the lathe.

Then made a hinge for it so it can be opened and closed easily.

Added a border at the top edge to prevent chips from entering.

And working on the lathe.

Still need to add some reinforcement and bits, more to follow.

Cheers
Abraham

andyf:
Hi Abraham,

You might consider heat build-up inside the motor enclosure, and put some ventilation in there. David (Stilldrillin) has burned out a motor or two, so he fitted a computer fan. So did I. David's is in this thread:
http://madmodder.net/index.php/topic,7560.0.html
and mine is shown here:
http://andysmachines.weebly.com/motor-cooling-fan.html

Andy

modeldozer:
Hi Andy.

Thank you for mentioning a fan, I will keep it in mind, especialy since I also cooked a motor. Nothing burned, just lost all its power.

Cheers
Abraham

modeldozer:
Hi everyone,

Finally had some clear whether to finish the guard.

Punched a hole for the power cable.

Build a fixing system for when it is closed.

And all done, painted and fitted.

Cheers :beer:
Abraham

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