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Dividing Plates

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Michael Gilligan28/11/2017 10:11:25
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Posted by larry Phelan on 28/11/2017 10:02:01:

There a many errors in the books supplied with these tables,no matter what the make. Dont believe all you read !

.

Which is exactly why I suggested 'learning' ...

MichaelG.

Neil Wyatt28/11/2017 13:06:57
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Workshop --> Processes

Or use this link:

www.model-engineer.co.uk/news/article/corrected-dividing-tables-for-vertex-hv6-dividing-head/23123

Andrew Tinsley28/11/2017 15:00:12
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Hello Neil,

I seem to remember that someone spotted an error in the table you refer to. I cannot work out if that error has been corrected or not. Can you confirm it is now as error free as possible?

Andrew

Brian Wood28/11/2017 15:06:16
2742 forum posts
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Andrew,

You can do some checking yourself to be sure what you read makes sense.

As an example with a 40:1 dividing head (Brown and Sharpe design) the maths is 40 divided by the number of divisions you are wanting to put into the component. You can then compare that with the table results to see if the maths is correct and if not, the table value will be wrong.

Regards Brian

Neil Wyatt28/11/2017 19:30:36
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19226 forum posts
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Posted by Andrew Tinsley on 28/11/2017 15:00:12:

Hello Neil,

I seem to remember that someone spotted an error in the table you refer to. I cannot work out if that error has been corrected or not. Can you confirm it is now as error free as possible?

Andrew

My recollection is that Howard corrected it, but I suggest sense-checking your results. You can also download his spreadsheet to see how they are derived.

Andrew Tinsley28/11/2017 20:09:45
1817 forum posts
2 photos

Thanks Neil,

I will get the brain in gear and download the spreadsheet and check the suspect entry.

Regards,

Andrew.

Andrew Tinsley28/11/2017 20:09:46
1817 forum posts
2 photos

Thanks Neil,

I will get the brain in gear and download the spreadsheet and check the suspect entry.

Regards,

Andrew.

Howard Lewis29/11/2017 21:58:08
7227 forum posts
21 photos

A little acccessory that has proved useful is home made pin to sit in in a hole behind one of the sector arms, once they have been clamped together. It lessens the chances of moving the sector arms accidentally.

F W I W, try to get into a sequence of actions, such as: unlocking the table, indexing, resetting the sector arms, turning the handle, locking the table, cutting.

If you have a memory, and powers of concentration like mine, you will need to! (not to mention lack of typing skills)

Howard

Edited By Howard Lewis on 29/11/2017 22:00:33

Neil Wyatt29/11/2017 22:57:31
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19226 forum posts
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86 articles

My technique has been to use a 60-division dial with a 60-turn worm, so only 6-arc minute resolution.

I do a spread sheet that lets me know how many full turns and then what dial reading to carry on to. It requires much care and yes I do get too many cock-ups.

A stepper powered table is on the horizon. I bought and HV6 but I think it's too big to convert as it will be totally HUGE! But surprisingly nice so I will keep it, especially as I have a 10" gear coming up!

So will probably get a small 4" table for conversion.

Brian Wood30/11/2017 10:08:21
2742 forum posts
39 photos

Howard,

My home made pin started off as a golf tee, suitably slimmed down. I now use cocktail sticks, fiddly pins are easily lost and I just break off a length that suits clearance with the winding handle. The method has prevented a potential failure from lost position more than once; catching the sector arms with the handle and pin is all too easy

Brian

Howard Lewis30/11/2017 11:11:44
7227 forum posts
21 photos

Thank You Brian!

What a good idea. Must chat with some of my friends who play golf.

Much less likely to get lost than a bit if steel rod.

Howard

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