Play in new arbour for mill

[Ian PParticipant @ianp]

Running the spindle at the lowest speed is really only OK if its very slow, say less than 100 rpm. In any event the speed must not be fast enough to cause any bounce.

Whilst your plunger type indicator is not ideal you could probably just get the tip of it to bear on the on the inner surface at the mouth of the spindle taper bore.

Regarding the 'side by side' play you mentioned, its not really clear what you mean. I take it to be that you are turning the spindle slightly (CW and ACW) and seeing play in the driving splines? (if so, nothing to worry about).

If its 'side to side' movement and its not play in the bearings then it could be the quill is loose fit in the head casting.

Ian P

[MadMikeParticipant @madmike]

Put the chuck on the arbor. Then put a known accurate part in the chuck, and I suggest a hardened dowel pin of around 12mm diameter. Then clock the dowel pin to see if it runs true.

What I wonder do you intend to fit in the chuck when working? A drill perhaps? If so after checking the pin put a known size drill in and drill a hole about half an inch deep. Then check the diameter of the hole produced, and using a lever clock check if it is actually truly circular. If it the size that you expected and is round, rather than oval then everything is fine.

Obsessing about theoretical "run out" is not important. The important thing is what the machine produces. If the run ouit is still unacceptable I would suggest that you check the mill spindle for accuracy. You say it is a second hand mill and of course it may have wear and need new bearings or adjustment,

[Mike PooleParticipant @mikepoole82104]

The movement you suspect in the spindle may be the quill in the body, put all quill and axis locks on and check they are effective before taking any measurements.

Mike

[Antony HardingParticipant @antonyharding74298]

Hi Guys,

Thank you for all the great advice and can see I need to do more digging into my issue. As I haven’t use this mill before and is my first one, I only have this arbour to work with.

I will have a go and getting the dial indicator on the inside face of the taper and will report back.

On a side note if anyone can point me on any info in to checking the bearings and how to adjust fitment that would be much appreciated.

[Antony HardingParticipant @antonyharding74298]

So as an update I did manage to get the dial indicator on to the internal taper spindle and got a runout of 0.11mm while on a slow rotation 100 rpm, which I understand is far from acceptable. And yes, would imagine the route of my arbour runout.

Thank you all for your help and guidance on this, and smile…. now need to start a new post in “how do I sort out this runout”.

[JasonBModerator @jasonb]

Last couple of replies moved to new thread here

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