If you set say 0 degrees at the side index mark on your new Vertex rotary table when using it with the table vertical, like this...


HV6-5-30%.jpg

Wouldn't you be a little surprised to see the reading below (267 degrees) on the extended vertical centre-line at the top, i.e. 93 degrees different instead of the expected 90 degrees?


HV6-3-30%.jpg
Note; I have scribed the lines across the data plate to show the extended vertical centre-line that passes back down across the large flat base base of the unit as an easy second reference when using the r/t in this way. Also confirmed with a dial gauge sweeping the edge of the table.

The posed picture below shows that I took these lines north/south & east/west through the centre of the base & 'round the corner' so to speak to the right...

HV6-8-30%.jpg

To find that the index plate was about 3 degrees misaligned as below (no surprise).

HV6-2-30%.jpg

Easy fix - move the plate up.. But no, there is insufficient room because the main body casting gets in the way directly above & filing out the slots in the plate would leave little metal for the lower screw to grip on. Re-drill & tap new screw holes about 4mm higher? Same problem due the casting.

Solution; Make a new asymmetric index plate as below.

HV6-1-30%.jpg

Which gives the desired 270 result up top...

HV6-7-30%.jpg

My question is; has any one else on this forum seen this issue?

It is not a problem if you are just using the table in one plane, but if you mix & match horizontal & vertical use plus index lines as I did at that time (Not good practice perhaps?) on a part & then notice later that surfaces or drillings are not at true right angles, it could be a bother. Or worse! Bad language or spanner chucking...
Anyway, it was fixed a good while ago & no problems since.
Attached Images




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