John:
It sounds like the MOSFETs have blown. We have replacements that are higher
capacity.
Regards,
Chris Wood
LittleMachineShop.com <www.littlemachineshop.com>
The premier source of parts and accessories for mini lathes and mini mills.
221 E. Walnut St. #110, Pasadena, CA 91101
(800)981-9663 * Fax (626)584-5844
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-----Original Message-----
From: John [mailto:moran03@...]
Sent: Sunday, March 23, 2003 8:32 AM
To: 7x12minilathe@...
Subject: [7x12minilathe] 7x12 Blows Fuses ?
My 7x12 which is now 2.5 months old popped its fuse shortly after
startup Friday, just as I was beginning a parting cut at low speed.
I installed the replacement fuse and , with the speed control in the
OFF position and the tool backed away, the lathe started as if it was
at full speed and the fuse popped again in less than a second.
This is a relatively new unit so I called Homier and they promised to
call me back on Monday. I'm just wondering if this is a common
problem; my understanding is the Homiers use an SCR based controller
which is less prone to failure than the MOSFET types. My ckt board
has a sticker with FC250J/110V and the large power devices are
identified as K790 -- the board uses surface mount devices except
for power handling which are thru-hole. Anybody have more info on
the Homier controller?
Up until this happened I was very happy with the controller since it
allowed speed to be reduced to 12rpm, slower than most references in
the 7x10 group specify. I did notice that when the speed control was
in the OFF position that rotating the knob slightly(as alowed while
OFF) made the chuck would move slightly and groan a bit. Since it
seems to be live even while OFF I always turn the wall outlet off
after use.
John
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