Sieg X2 mini mill blowing fuses

This topic has 5 replies, 5 voices, and was last updated 21 September 2021 at 23:42 by Paul Lousick.

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21 September 2021 at 20:50 #563782
David Joyce 6
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@davidjoyce6
Hi guys. I got a new osaki mini mill which is essentially a sieg X2. I have it a couple days, used it twice and the third time it wouldn't start up. I checked the fuse and it was blown which was strange because it was working fine the day before. I put a new fuse in but this time the fuse exploded in the fuse holder, glass dust everywhere and destroyed the fuse holder.

I check for shorts and checked the motor but couldn't find a problem. The control board is the XMT2335, I took it out and looked for burn marks or blown caps but couldn't find anything obvious.

The mill states the face mill capacity is 30mm and I put an ER32 collet chuck in which is larger than 30mm so I wonder if that was too taxing for the power components in the board. I only used the mill for twenty mins or so cutting slots in 1.5mm thick steel tubing, I took full depth cuts but only took light passes each time. The motor was only warm afterwards not hot.

I had the same problem with my mini lathe and it turned out to be the motor windings burning out but that caused the motor to get very hot and smoke to come out. I had nothing like that with the mill. I think its a short and I am guessing its the mosfets or something but I have no clue really. I have limited knowledge of electronics. I measured the resistance between the live and neutral at the plug and its 0 ohms. Thats a straight short circuit isn't it?

The motor is 230 volt dc permanent magnet brushed 350 watt but I think its fine. Im replacing the bust fuse holder with a panel mount push reset circuit breaker but that doesn't solve the issue causing the blown fuses. I would love to get it fixed cheap rather than paying £142 for a replacement board. Very frustrating but just my luck. Any ideas are welcome
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21 September 2021 at 20:50 #33906
David Joyce 6
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@davidjoyce6
Not sure what to do
21 September 2021 at 20:53 #563783
Peter Cook 6
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@petercook6
If it's new, call the supplier and get it swapped.
21 September 2021 at 20:55 #563785
Dave Halford
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@davehalford22513
Send it back, there's 363 days left on the guarantee in the UK or 28 days in the US.
21 September 2021 at 21:33 #563794
John Rudd
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@johnrudd16576
David, I sent you a private message….disregard it if the mill is new and under guarantee…

the power semiconductoir devices are thyristors ( scr ) and form part of a full wave rectifier bridge across the mains…one or more is defective if you read 0 ohms…
21 September 2021 at 23:42 #563811
Paul Lousick
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@paullousick59116
As stated, if it is under warranty, take it back.

Using an ER32 collet chuck should not cause a problem. It is the size of the cutter that is the limiting size, not the holder. ER32 collets will only take cutters up to 21mm dia. which is smaller than the 30mm allowable for the mill.

Edited By Paul Lousick on 21/09/2021 23:43:25
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