I have a Warco Major milling machine and have just bought a set of chuck/collets from Lycorish for £55.29. My problem is when I put the dial gauge on the shaft it has a run out of half a thou very good, but when I move it down to the tool and the nut the gauge goes hay wire there is so much wobble I have cleaned the collet inserts and tried different tools which are brand new but it’s still the same what am I doing wrong Please help as I am new to milling.

If you made sure everything was clean before fitting the chuck to the spindle and you find run-out after that check the inside bore where the collet fits for runout, if that's as good as the spindle then the problem is with the collets.
For what you paid you really can't expect anything too good in the way of accuracy, a half decent chuck would cost as much as your total purchase, you don't say what type of collets but a good ER25 collet will set you back around £15, even more if you want greater accuracy but that is a waste of money if the chuck has any runout.

You may be able to return the collets and/or the lot for a refund.

Emgee

If the collets are ER type you have to load the collet into the nut before you put them into the chuck. The face of the collet should sit at or very close to the face of the nut. If it doesn't, you probably don't have the collet fitted correctly.

Iycorish 9Pcs Er32 Spring Collets Set 2/4/6/8/10/12/16/18/20Mm + 1Pcs Mt3 M12 Er32 Collet Chuck Morse Taper Holder Collet Power Tool Set

+1, well worth double checking.

Not clicking ER collets into the chuck properly is a common beginner booby trap. How to do it isn't immediately obvious. You can guess how I know. Click on this ArcEuroTrade link for pictures and description.

Fingers crossed that's the problem - easy fix.

Dave

Thank you everone and Dave and Pete now I have the collets installed correctly there is a big improvement I have 20thou on the nut and 40thou on the tool is this OK could probably impove the tool with different ones

I hope you don't mean 20 - 40 thousandths of an inch !! a thousandth is 0.001". (a hair diameter is approx 0.003" to 0.007".

Did you mean 0.0002" - 0.0004" ? ie: 2 - 4 ten thousandths of an inch perhaps ?

What are you using to measure, a DTI - have a look on the dial to see what the divisions are.

Bob

What are you using to measure, a DTI

Don’t use a dti - use a dial gauge. One only indicates a change, the other actually measures the change.

Unless you're using terminology in a way I'm unfamiliar with, I'm mystified by that claim.

Can you explain further?

Bill, Not done it yet is being a little precise and could be more helpful if he had explained the difference. I believe that a DTI is a finger gauge which Generally has a smaller movement that a Dial Gauge. That said, all the DTIs that I have seen are graduated and equally acceptable for measuring distance within their range.

For John's application, I would consider a DTI or Dial Gauge to be quite acceptable.

Bob

Sorry its a new dial gauge and I forgot its metric so its Fluctuating in thous 0.020 ether side of zero

With the new metric gauge its 0.20mm ether side of zero think the old gauge is no good

Thanks for the confirmation, Bob.

0.020mm would be very acceptable, John; 0.2mm wouldn't.

Hi John, Guys,

Check the insides of your collets very carefully !

This is what most of mine were like. I used a Stanley knife blade and a stone to clean the swarf remains up. After that I could easily get a couple of tenths of a thou or better.