Maintenance and setup checking my mill

[Ex contributorParticipant @mgnbuk]

I shall clarify.

We shall have to agree to disagree on that point, Martin.

Regards,

Nigel B.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by mgnbuk on 20/03/2023 11:52:55:

I shall clarify.

We shall have to agree to disagree on that point, Martin.

.

I suppose it depends upon how one interprets the word ‘should’

MichaelG.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, well I'll not claim that my machines are exactly spot on as far as the head and spindle alignment goes, but I don't believe they are far enough out to be worried about. I did tram my Champion and mini mill up, using the same method as Zan, by using a brake disc, but I skimmed an old one up after removing the portion that fitted to the car. After skimming I did some tests to see if both sides were parallel to each other and to see if the thickness was consistent. My tests at the time showed a difference of about 0.0005" in just a small portion, which I accepted to be good enough. I've done a test to show how I decided upon the runout, which shows the result under two DTI's while rotating the disc through one complete turn. It might not be the most precise way, but the same result can be repeated time and again. The two DTI's are on the same radius and when they are both moved to an different identical radius, the DTI readouts are the same and in the same portion.

When I do any tramming with this, I usually rotate it on the table three or four times and recheck the results. I can't say that I've noticed anything really out to get worried about when I mill anything.

Regards Nick.

[Chris MateParticipant @chrismate31303]

My mill is also "leaning" a bit as delivered, however it has two bolts you can force the head(Upwards) vertical using a measuring instrument as reference to check what you are doing. The distrubutersalesman was surprised to see it when I showed hin in person, seeing their latest ones and other does not have this ability of adjustment without adding shims(Resonable way of course). The additional question for me is why was it shipped this was, does tool pressure plays a role in decission-?

[petro1headParticipant @petro1head]

I did wonder about drilling and tapping 2 M6 bolts at the front of the column and using them to adjust

[Dave HalfordParticipant @davehalford22513]

Don't, your next posting would be about the strange vibration you now have.

[petro1headParticipant @petro1head]

Ok OK I wont

[Chris MateParticipant @chrismate31303]

The 2x bolts on my mill is in addittion, its not part of the setting or clamping surface where the shimming happens, so it should not interfere with the stiffness, most it should be checked at each height of operation of milling I would say.

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