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Help please Lathe running slow in reverse

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christraxon:
Hi all

hope someone can help? i have a clarke cl300m mini lathe and have just replaced the bearings which went fine but as i was testing out the lathe i notice that when i put the lathe into reverse using the switch on top the reverse speed is only about a third of the forward speed. is this normal or has somthing blown.

thanks

chris

John Swift:


Hi Chris ,

I don't know why they do it , but they do run the motor at about half speed in reverse

depending on how old your lathe is it can have one of two speed control boards


old machines use a FC250J speed control board (with two F.E.T transistors on one heatsink),
 part of the   forward /reverse switch links terminals  P1 and P4 in forward  for the faster motor speed range

later lathes use the XMT2325 speed control  (3 diodes and  2 thyristors on 5 heatsinks)
part of the forward / revese switch connects terminals P4 and P5 for fast (forward)
and P4 and P6 for slow (reverse)

one thing to watch out for is the push on connectors don't grip very well once you disturbe them

when I replaced the spindle bearing on my CL300m ,with taper bearings I had a bit of fun
making new spacers using the lathe was fixing !!

that was after working on the speed control  see hear :-
http://www.model-engineer.co.uk/forums/postings.asp?th=38809


 John

christraxon:
thanks for the reply john

so it it normal for it to run slow in reverse then my board is the XMT-2325.

thanks

chris

raynerd:
Chris, yes I believe this came up on another post in the last few weeks but from experience, my CL300 went slower in reverse.

trevoratxtal:
Many lathes are set to run slower in reverse, the reason is.
To lessen the chance of the chuck unscrewing.
Trev

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