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12Volt DC Electric Motor Controlled Powerfeed

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John Swift:
Hi Andy

a  4 pole 3 position switch is used on sieg C3  minilathes as the forword / reverse switch  ( eg  Machinemart CL300M )

the limit switches are a  good safeguard

Im not sure of UK prices but little machine shop lists it as item 1335 @ $11.95

       John

andyf:
Hi John,

Good point about the mini-lathe switch. Mine was a 2A at 250 VAC, 5A at 125 VAC one which these people http://www.fephydraulics.co.uk/Directional-Control-Valves-contact_us.html were, for some weird reason, advertising on Ebay for around a fiver.

I'm hoping the limit switches will have enough consistency to stop the table in the same place on repeated cuts. Hence the need for motor braking. Though, looking at Snub's photo, my gearmotor is fleapower compared to his, it runs at over 15,000 rpm flat out. The gearing is 148:1 so at that speed the output shaft is doing around 100 rpm. Despite its relatively small mass, the speed of the armature means that the output shaft overuns by a full revolution if the motor is simply disconnected without any braking, which wouldn't help repeatability much when driving a 10 tpi feedscrew. Only once I've finished and fitted the power drive will I know if the braking will be reliable enough.

Andy

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