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25th Sep 2022, 06:31 PM #1Member
- Join Date
- May 2018
- Location
- Cairns, Qld.
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- 70
Vertex Rotary Table - Inaccurate index
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.Last edited by Halifax614; 25th Sep 2022 at 06:33 PM. Reason: damned smilies
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25th Sep 2022, 06:44 PM #2Diamond Member
- Join Date
- Mar 2014
- Location
- South of Adelaide
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- 1,225
Its not really an issue as you should only use one fixed mark for indexing. Don't think the indexing marks on any of the rotary tables i have used line up horizontally or vertically.
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25th Sep 2022, 07:10 PM #3Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
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- 1,894
It may not be a big problem if you know about it, but this flaw is in the "not nice" category I think.
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25th Sep 2022, 07:32 PM #4Diamond Member
- Join Date
- Aug 2019
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- Revesby - Sydney Australia
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- 56
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- 1,185
I'm wondering if the mark up the top is just a scratch+dent in the label?
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27th Sep 2022, 10:35 AM #5Member
- Join Date
- May 2018
- Location
- Cairns, Qld.
- Posts
- 70
Rotary Table
Thanks for the feedback gentlemen. I thought at the time that just a little bit of extra effort by the manufacturer would have prevented the 'mismatch' occurring.
As mentioned, I scribed the line & put the centre punch mark on the data plate as a second reference when using the R/T in that upright position.
(I should add that I am very impressed with the ability of the cameras in a modern phone to focus sharply & produce such good results all round).
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27th Sep 2022, 12:57 PM #6Most Valued Member
- Join Date
- Jun 2007
- Location
- sydney ( st marys )
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- 64
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- 4,887
Why not just use the same reference mark in both plains?
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