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| Transmission for table feed |
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| awemawson:
Tumbler reverse is described nicely here: http://www.lathes.co.uk/latheparts/page16.html |
| BillTodd:
I thought you might like to look inside a couple of commercial units: This one is an Align (pretty much the same as the Servo Units) The DC motor is 110v @ ~3A max it uses a electrical reverse and a simple dog clutch |
| BillTodd:
This one is a Bridgeport: The motor plate is knackered but judging from size it looks to be about 1/2hp. Inside is a bevel gear and a dog clutch. The clutch is engaged by a spring on the shaft. it is held off by the lever (with the bent axle!) and spring (left). The operating rod (centre vertical) has a cam that releases the lever. Reverse is electrical. |
| BillTodd:
And this is one I made for my Drill/Mill : The thing started life as a bed lift mechanism. The dog-clutch is engaged with a solenoid. Reverse is electronic. Power is limited to about 75w, No rapid. (my mill has roller nuts, so there is very little friction on the X axis lead-screw) |
| John Hill:
Slow and steady is more useful than rapid, rapid is good but not essential if you can easily disengage the motor from the feed screw just use the handles for positioning. |
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