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Thread: Mini drill
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1st April 2018, 12:51 AM #1Novice
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Mini drill
Was drilling some very hard steel, 1% carbon, to make a tool holder for the lathe when the belt started to slip because it had heated up due to friction. Tried re-
tensioning the belt then found that the rear cone pulley was rubbing on the belt cover.
Decided to lift the cover to see what was going on and found that the makers, Chinese has inserted a micro switch under the cover , apparently to stop the motor from working when the cover was open.
The drill was being used at slowest speed available which meant that the belt was closest to the base under the cover. The clowns in their wisdom!!!! had brought the electric cable up into the belt chamber in such a manner that the belt was abrading on the cable. At the stage I found it one of the wires had partially abraded through with the potential to have live wires loose in the chamber.
I would recommend that anyone having such drills take a close look in the belt chamber in case yours may be at risk.
My solution is to remove the micro switch and bridge the connections on the main switch assembly.
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1st April 2018, 09:47 AM #2.
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I don't think removing the micro switch is a good idea.
Re-routing the cable is probably more appropriate.
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2nd April 2018, 01:01 PM #3
Like BobL, I am not keen on bypassing safety interlocks etc. So many things could go wrong if the motor continues to run with the belt cover open, including the old finger jambed in the belt, the belt breaking and able to fly across the room possibly taking out an eye, something dropping down onto the belt and getting flung out with similar effect etc.
While having the belt chewing the cable is not good, ideally the solution would be to adjust the cable routing to clear the belt, and lock the cable in position, (clamp, or glue) or even armour the cable with something tougher than the PVC insulation on it.
On another front, does the drill motor operate at 240VAC, or at a lower voltage because I am wondering what voltage the interlock switch and cable operate with and suspect that there might not be a low voltage system dedicated to belt cover interlock system. On the other hand, if the motor operates at say 24V, exposure to the cable and switch might be a much lower risk.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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2nd April 2018, 01:20 PM #4
By law any pedestal drill sold in Australia must have a safety switch on the belt cover.
Re-route the cable to the motor, its a no brainer or better still, if you can afford it, get a better quality drill press.The person who never made a mistake never made anything
Cheers
Ray
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2nd April 2018, 07:04 PM #5Senior Member
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2nd April 2018, 07:26 PM #6.
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