WM16 Tramming instructions

Having got the Myford running again. i was doing some work on the WM16

Whlist the vice may not be 100% parallel to the X axis, this would have a

occurred whether it was 100% spot on

Had to mille doen a length of 3/8 (wide) bar to 5/16 i took a cut on the rear face to suare it all off , then moved the work so i could now take the rest off to get it to 5/16

The cut was not parallel to the rear face, in fact the workpiece got wider towards the end Workpice in rih hand side pointing towards the right

Even if the worpice was at a larger angle off 'parallel' surely the two cuts should give the same width all down the work..

Now because of this it got me wondering about other thnigs so tonight i put the Digitl protraxctor on the bed with it resting on the Y dovetail ( hope that makes sense) it measured 0.00 degrees When i put it on the bed it showed 0.40.

I thenput a DTI in the drill chuck and spun it round 180 dgrees. The was a difference of about 20 thou ( i didnt check if it were + or -

Any thought how i might go about rectifying these 'problems'?

TIA

It hasn't been 'overworked' whatsoever

Edited By ron vale 1 on 24/07/2020 22:21:45

Shims under one side of the column. Do a search on Google and also here on MEW. Lots of examples of how to fix it.

Paul

Have you adjusted the gibs before making your measurements? A poorly adjusted gib could make a difference if the table was well of its centre point, particularly on the long travel.

Put a dial indicator into the spindle and on a magnetic holder on the collum and lock and unlock the clamps on each axis in turn just to see if there is any play and it gives you an indication of what is happening before you adjust things and repeat after you have adjusted things. As well as tram the head both directions and write down the results. I write them on the bed as well to give me an indication of god or bad results.

David

Edited By David George 1 on 26/07/2020 10:12:01

Shims under one side of the column.

But only after checking head to table squareness - this isn't an un-keyed round column mill where workpiece registration is lost when the head is moved.

It is just as important that the column is accurately square to the table in both planes to mantain tool position when the head is raised or lowered & just shimming the column to correct a spindle alignment issue without regard to column alignment will just be shifting the problem for one area to another.

As a former colleague (a rather crusty machine tool fitter, apprentice trained at Asquiths in the early '60s) use to say at my last employment "Build 'em right from the bottom up, or you just make problems for yourself". You can't look at one check in isolation - start from the bottom & work your way up. Fix any issues as you find them - that way you will fix the particular problem without introducing other problems as you go. You can see the required order from the Schlessinger test protocols for the type of machine, as these specify the order in which checks are to be carried out - spindle alignment ( "tramming" ) is amongst the last checks to be done, so you would not just "jump in" and do that check first.

Sadly there are no reliable short-cuts to a properly aligned machine tool - if there were, be assured that by now the Yorkshire based machine tool builders would have found them !

Nigel B.

Ron,

have a look at this You Tube link

Ketan at ARC.

Edited By JasonB on 26/07/2020 13:38:59