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sx3 mill again im afraid

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andy mulholland29/11/2021 16:02:36
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28 forum posts
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im wondering if anyone can offer any pointers in how to identify my issue...

my mill arrived on a pallet and had to be transported to a 1st floor workshop..I didn't try and run it on the pallet but stripped it into parts to allow for the move..I took the opportunity to clean and oil the machine and re assembled it ...switched it on and it won't run...

in no electrician but the electrical disconnection points that enabled the dismantling were straight fwd connectors and plugs into boards so I felt confident enough... as a back up I took photographs and im happy its reconnected as it arrived... I did remove the chuck guard and microswitch...but briged that connection with a link..

when power is turned on the mains tell tail light illuminates.... the digital rpm display also lights and the emergency stop switch seems to function ..ie the digital display light does out till the emergency stop is reset....

ive disconnected the motor windings and done continuity checks between the 3 wires and get a consistent 2.4 ohms between the 3 pairs,,.no obvious circuit to earth on the windings when checked with a multimeter...

thats where I am... I know some on here are clued up on such things so if anyone knows of other checks I could do with basic equipment..ie multimeter id be grateful...

thanks

Andy

Adrian R229/11/2021 16:08:58
134 forum posts
5 photos

I don't know the machine, but you say " I did remove the chuck guard and microswitch...but bridged that connection with a link.."

Might be worth testing the microswitch you removed to see if it was NO or NC - perhaps your link is telling the machine the guard is open and thus inhibiting the start?

I would definitely suspect the safety switches - I have a mini-bandsaw bought as "not working spares/repair" which turned out to be nothing more than a misadjusted door switch.

<edited for typos>

Edited By Adrian R2 on 29/11/2021 16:10:04

john fletcher 129/11/2021 17:14:57
754 forum posts

I'm not much help here Andy, but to enable forum members to help you, you will have to tell them the make, model number and if possible a picture or two of your mill. you took some photos when it arrived so how about posting them on here. As Adrian above says it could just be one of those micro switches not closing properly. For the motor to run, all safety micro switches should be closed. John

andy mulholland29/11/2021 17:43:48
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28 forum posts
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can I thank you both for the replies...

to say I feel like a right plonker would be putting it mildly... you are spot on about the chuck guard switch... inserting the link prevents the machine from starting... im getting to old and my brain just doesn't function logically any more..

thanks again

regards

Andy

andy mulholland29/11/2021 17:50:02
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28 forum posts
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and sorry John I did see your points about providing the relevant information and posting pictures.... ill have to check on how to post pictures again ...but your points are noted for the next time ..

thanks..

Andy

JasonB29/11/2021 18:25:22
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Make and model is in the thread title as 99.9% of people know who makes the SX3.

Always a good idea to run a new machine while still on the pallet, saves a lot of problems if is subsequently does not work

andy mulholland29/11/2021 18:51:37
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28 forum posts
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that was the first thought I had Jason , and Id like to think if I had run it on the pallet then I would have avoided all the grief and time ive spent looking for faults when logic was that it had to be the link I inserted..

a feeling of great relief but also one of total stupidity....

the thought of having to get that mill downstairs again was making me feel poorly crying 2

Andy

not done it yet29/11/2021 20:22:19
6504 forum posts
20 photos

the thought of having to get that mill downstairs again was making me feel poorly crying 2

Going downstairs is easier - you have gravity to help. Assuming stairs are around 45 degrees means the parts only effectively weigh 70% cf lifting. A plank, to slide it down carefully, can make it easy - as long as you can keep it under control.🙂

Martin Kyte30/11/2021 08:31:43
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2634 forum posts
46 photos
Posted by andy mulholland on 29/11/2021 17:43:48:

can I thank you both for the replies...

to say I feel like a right plonker would be putting it mildly... you are spot on about the chuck guard switch... inserting the link prevents the machine from starting... im getting to old and my brain just doesn't function logically any more..

thanks again

regards

Andy

Don't be so hard on yourself. My standard proceedure when designing safety cut-outs is to make them open circuit fail. Making the circuit enables the system. If you design the other way about as it appears on your machine then if the microswitch fails or the wires break the motor will still run which is about as usefull as a chocolate tea pot.

regards Martin

Steviegtr30/11/2021 15:01:04
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2308 forum posts
317 photos

This is another example of why this Forum is so good.

Always someone to help with the odd problem. Great result.

Steve.

old mart30/11/2021 16:44:23
3487 forum posts
213 photos

It's nice to get a good result with an easily sorted fault. I had a similar problem with my 7 x 12 mini lathe years ago when the speed pot failed. It had a switch built in and I got another from Maplins. That turned out to be the wrong type, NO or NC and when I eventually figured out what was wrong, I took the switch part to bits and changed it around and it has worked ever since. No getting a correct replacement from ARC back then, I had not yet heard of the firm.

andy mulholland02/12/2021 16:25:19
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28 forum posts
5 photos

I have just caught up with the additional comments... all noted and the words of encouragement appreciated..

everything is back together now including the dro that was fitted... ive never had the luxury of such a system before and was surprised to see all the available functions.. it appears to be very clever. laugh...was getting a bit worried cause the instructions were a bit unclear in the translation but a few trips on the old you tube has helped a bit... I hope I can get to grips with it eventually...getting rather excited at the prospect of using the mill..

Andy

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