I bought a new Taig mill from Deepgroove and the spindle doesn´t run easily and it gets very hot after just some minutes on 8000 rpm. It doesn´t help to loose the nut at the top, so I need to know if this is normal for new spindles and if it will improve after I have used it for a time. Or could this damage the spindle in any ways?
Are there anything to do with a problem like this?
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I had that one time on a mini mill after changing bearings.
Had the preload too heavy. This could be the cause.
But when I loosened the top nut I also had no difference.
The reason: The bearing was a tight fit on the shaft so stayed true.
Fix was: Undo the nut a bit and hit the shaft top. The bearing shifted which looseened the preload. Then started the gradual tightening process again until I got it right.
Hi,
if its new claim under warranty....it should work straight out of the box no problems.
Craig
address supplier with your claim. The spindle should run very easy. Check the static runout with micrometer, check with spindle specifications.
The problem is that I bought it from an ebay dealer (deepgroove) and even if he accept a return, the shipping cost from norway to USA is very expensive, so it will maybe be a cheaper option for me to disassemble the spindle block, check the bearings and maybe replace them.
right.
It's possible, that bearings are still good. Maybe it's just enough to assemble it back properly.
They can never be assembled correctly, the design is the problem they use a regular Deep Grove Bearings and these are not suitable to be pre-loaded, the design is as cheap as you can get and anyone that buys a machine with a spindle design like this can expect these kind of problems, the preload nut they use can be adjusted but even this is hit and miss it is what it is a poor design for a spindle
Mactec54
This is an interesting read on spindle / bearings
https://axotron.se/blog/changing-spi...taig-cnc-mill/
You could redesign the one you have by using precision angular contact Bearings, you would have to make a spacer to go between the ( 2 ) Bearings this spacer you machine to give you the right amount of Preload Here is a spindle I made recently
And another spindle I built some years ago on the Zone, to give you an idea of how you could change the spindle you have with just bearings and a spacer
Or even just adding a spacer between the Bearings you already have, this will then not allow the preload to change once you have made the spacer the correct size
https://www.cnczone.com/forums/cnc-w...dle-build.html
Mactec54
Do you think this spacer is an option or is it already installed inside the block I have?
https://taigtools.com/product/er-spindle-cartridge/
So that looks promising but it would have to have 2 Spacers ( 1 ) on the inside of the Bearing races and ( 1 ) on the outside of the Bearings like you can see
So is hard to tell what they have done there, without a parts drawing if it has a spacer on the inside of that outer one then that would work
Does your spindle already have this I would not know only the manufacture would know this, if it has then the inner spacer may be to long it would only be tenths of ( 1 ) thousandth's or a few microns to come of the center spacer
It all depends how they are preloading the Bearings it could be the outer spacer or the inner spacer if they have one, so if you where to take it apart after notifying the manufacture, you would measure the length of the spacer or spacer's what ever the number is ( 1 ) will be longer than the other
Mactec54
I have been in contact with Taigtools but they don´t answer me anymore. They asked me to send a picture of the spindle and nut in the housing and I sent a picture where it also show that it was driven by a consew motor and maybe that´s the reason for not answering me anymore. Anyway I think it´s a very bad customer service they offer.
The problem is likely that Taig is the manufacturer and you bought from deepgroove who is supposed to provide you with the customer service. He sells at the deepest discount possible but there is a risk you take when paying bottom dollar… if things go wrong he’ll ghost you. At least that’s what he did to me years ago when he paired the wrong motors with a xylotex board and I couldn’t get over 10 IPM feeds without missing steps.
That said, couple questions… how are you measuring RPM? The spindle is able to do 10k but the sealed bearings get too hot much above that. The seals are what generate most of the heat. Without seals they have a higher limit. Have you placed a tach on the actual spindle pulley?