Rotary table / indexing (help)

[Nick_GParticipant @nick_g]

.

I have to make the following part.

I have done so without issue and made a little threaded mandrill to hold it.

But I now have to (as per the drawing) drill 8 1/16th holes in the rascal around the outside of it's flange.

I have a rotary table that I bought a few months ago and have fitted a spare chuck to it.

At the same time I bought the rotary table I also ordered a set of indexing plates.

So all should be good and what's his problem I hear you cry.

The problem is I have no idea how to use the plates, which plate and number of holes and the maths involved.

I do realise that the angle between each hole is 45 degs and I could simply use the graduations on the table. Especially in this case as it's non-critical. But I would like to know how to use the kit.

Cheers, Nick

Edited By Nick_G on 16/01/2016 13:07:54

[Nick_GParticipant @nick_g]

[Michael GilliganParticipant @michaelgilligan61133]

Nick,

Although it relates to the little Sherline Rotary Table

…. This is worth reading for background.

… Follwed by this  [which is also not your RT]

MichaelG.

 

Edited By Michael Gilligan on 16/01/2016 13:45:56

[RobboParticipant @robbo]

Not the same table, as yours looks like a 6", but might help – **LINK**

[LambtonParticipant @lambton]

Nick,

This is a very simple indexing job not really requiring the use of division plates. Just note the first hole position ( zero if you can arrange it) and then turn the table handle through 45 degrees for each successive hole, remembering the lock the table each time before drilling.

Eric

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Nick_G on 16/01/2016 13:04:52:

I do realise that the angle between each hole is 45 degs and I could simply use the graduations on the table. Especially in this case as it's non-critical. But I would like to know how to use the kit.

Cheers, Nick

.

Eric,

What you say is true … But Nick did explain his motives ^^^

MichaelG.

[Vincent CutajarParticipant @vincentcutajar96446]

**LINK**

And this is the user manual which might help you.

http://cdn0.grizzly.com/manuals/h7527_m.pdf

Vince

 

 

 

Edited By Vincent Cutajar on 16/01/2016 14:26:09

[Nick_GParticipant @nick_g]

.

Thanks guy's

Nick

[Harry WilkesParticipant @harrywilkes58467]

Thanks Vince

H

[Harold Hall 1Participant @haroldhall1]

If I may be allowed, once more, to publicise one of my books, you may find my book "Dividing" of help Nick. This covers amongst other things, the mathematics of using a dividing head/rotary table but also lists all the available divisions using the hole numbers in common division plates, and for wormwheel ratio's of 40:1 60:1 and 90:1 . For more details regarding the book, see http://www.myhobbystore.co.uk/search.asp?k=harold+Hall&x=23&y=2 here.

It also includes simple methods of achieving low number divisions and more complex methods for higher numbers.

Ady, if you remember, last time I mentioned my books, or was it a page on my website, you prompted me to add a link on it back to this forum, I have not forgotten. However, with there being at least 15 forums that I visit, and wanting to make a good job of the task it I am finding it difficult to find the time. I do though still intend to do it.

Harold

Edited By John Stevenson on 16/01/2016 16:32:11

[Harold Hall 1Participant @haroldhall1]

John

I accept your edit and feel a link to my website for details of the book plus a link to My Hobby Store for purchasing it would have been the correct way to go.

However, in this case, to my surprise, and no doubt yours John, My Hobby Store do not list the book, actually only listing 2 of my books.

If you are interested in the book Nick you will find it widely available on the Internet.

Harold

[Howard LewisParticipant @howardlewis46836]

Nick,

Your Rotary Table looks like my Vertex HV6.

The Handbook that comes with it contains a parts list, and brief instructions on how to use it for dividing, and a table, (Inside the back cover), giving the Plates to use and the number of turns and holes, for each set of divisions, upto 99.

But not all division numbers are available (such as 28,51,52,53,59,61,64,67,68,71,73,76,77, 79,83,84,85,88,89,91,92,and 97)

Mine has a 90:1 worm/wheel ratio, so for 8 equally spaced holes the table gives

' A' plate, 20 hole circle, (The outermost one in this case) 11 turns and 2 holes of the crank handle, between each drilled hole.

If you have not got the "Operation and Service Manual" for the table, send me a PM, and I'll see what I can do to help.

Are you UK based, if so, whereabouts?

A recent tip was to make up two pegs to be a good fit in the holes, and short enough to be clear of the peg in the handle, as it rotates, to fit BEHIND the fingers, so that if you catch the fingers while turning the handle, they do not move to lose your starting position. As you need to move the fingers round, the pegs are moved to retain their position. (Obviously, make sure that the screw clamping the two fingers together is tight)

I've just done this, and it is useful.

Howard

[mickParticipant @mick65121]

I had an interesting dividing head indexing problem the other day, I had to initially index 12 degrees from zero, then 16 degrees ,then 24 and repeat it nine times. I made a nine hole plate, which means every hole is one degree. I've used it several times since, its extremely useful for indexing any multiple number of whole degrees, can't imagine why I didn't make one years ago.

[Nick_GParticipant @nick_g]

.

Thanks for the information.

Nick

[Roger QuaintanceParticipant @rogerquaintance14196]

Posted by mick on 23/01/2016 15:42:42:

I had an interesting dividing head indexing problem the other day, I had to initially index 12 degrees from zero, then 16 degrees ,then 24 and repeat it nine times. I made a nine hole plate, which means every hole is one degree. I've used it several times since, its extremely useful for indexing any multiple number of whole degrees, can't imagine why I didn't make one years ago

Just bear in mind not all rotary tables and dividing heads have a 40-1 worm, some are 60-1

[norman valentineParticipant @normanvalentine78682]

Dave Gingery has a very clear explanation of how to work it out in book number 6 of his series " Build Your Own Metal Working Shop From Scrap" "The Dividing Head & Deluxe Accessories".

[mickParticipant @mick65121]

I've never come across a dividing head that isn't 40:1 What make is a 60:1 Certainly smaller rotary tables can differ, while the larger commercial ones, in my experience, are 40:1

[norman valentineParticipant @normanvalentine78682]

Mine is 30:1, but then I did make it myself.

[Anonymous]

Just to be different my large (12&quot commercial rotary table is 90:1. However, my universal dividing head is the standard 40:1.

Andrew

[Enough!Participant @enough]

Posted by mick on 27/01/2016 17:04:07:

I've never come across a dividing head that isn't 40:1 What make is a 60:1

Myford

[Nick_GParticipant @nick_g]

Posted by mick on 27/01/2016 17:04:07:

I've never come across a dividing head that isn't 40:1 What make is a 60:1 Certainly smaller rotary tables can differ, while the larger commercial ones, in my experience, are 40:1

.

Here are a couple. **LINK** The HV6 being the one I have.

Nick

[BazyleParticipant @bazyle]

I have a table with a primary ratio of 48, followed by a secondary worm wheel of 14. Keep thinking I must have miscounted.

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