Clarke cl300m

This topic has 4 replies, 2 voices, and was last updated 23 November 2010 at 16:36 by john swift 1.

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23 November 2010 at 10:46 #59186
Tony Scott
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@tonyscott71389
Hi, Just acquired the above lathe which i knew had a fault on the motor or PCB board, i’m now sure it’s the motor now but i wanted to know what the length the brushes should be, mine are 1/2 inch long. There appears to be no burn marks on the armeture or commutator but the motor arcs really bad and will blow the fuse. Just had a quote for new motor £102 + p+p. Ouch!!

Any help would be appreceated.

Tony.
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23 November 2010 at 10:46 #5300
Tony Scott
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@tonyscott71389
23 November 2010 at 13:12 #59188
john swift 1
Participant
@johnswift1
Hi Tony ,

the brushes are about 14mm long to start

I expect they should work until they are about 8 or 9 mm long ( 3/8″ give or take a bit)

( depends on the gap between the brush holders and commutator ,

and the length of the wire tail from the brush)

to test the armature for shorted turns or an open circuit

remove the armature and apply around 4 to 6v ac to opposite sides of the commutator (about 1/2 amp at 6v ac )

then measure the voltage between adjacent segments all the way round

the voltages should be within 5 to 10 percent

John
23 November 2010 at 15:43 #59193
Tony Scott
Participant
@tonyscott71389
Hi, thanks for reply, been reading your other posts on pcb faults and found it interesting

I have removed the motor and powered it of a 12v supply and the motor turns, very slowly so i’m assuming the motor is OK now so i’m guessing it will be the PCB board.

I’m not very good with electronics but my brother is a whizz and will be taking it away with him to test.
23 November 2010 at 16:36 #59197
john swift 1
Participant
@johnswift1
Hi Tony ,

a quick test on my lathe with a 12v dc supply (gellcell) and gear train not connected

with the back gear in high gear

the spindle speed is 100 rpm and the motor current 320mA

in low gear the spindle speed is 40 rpm at 230mA

the belt reduction is 17/31 , high gear is 20/21 and low gear is 12/29

giving you a motor speed of 191 rpm in high gear and 176 rpm in low gear

hope this gives you an idea what to expect

John
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Clarke cl300m

Clarke cl300m

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