Thread: dividing plates, dividing head

Originally Posted by Stustoys

Would you like to show you workings for that?
I cant make it work. I get 170 divs

Stuart

The Engineers Black Book would agree with you there. Interestingly, the book doesn't list 127 divisions at all in its table (page 68).

I believe thats because 127 is a prime number. So for a rotary table or semi universal head you would need a 127 hole plate*. Which you could make on your rotary table (though I'm thinking it would have to be pretty big diameter), then when you divide the job any errors in the plate will be reducted by what ever the ratio your worm gear is.

Stuart

*I checked this with 90:1 and 40:1 ratio and my maths says its correct...... for what ever that is worth hehe

Originally Posted by eskimo

thanks guys.....but some of these answers are above me at the moment

maybe I need one so that I can have a play.....or get some plates for the rotary table and have a play with that till I realise its limitations decisions decisions

What exactly do you think you will use one for-just your splines or are there other things in the pipeline? If your thinking of gear cutting then the RT and plates will do you for most of the work. Michael G and i are passing ideas back and forth on an indexing plate capable of 127t gears for members to use. It may not yet happen but it then it might.
If it is just the splines then the indexing plates and a tailstock would be a much cheaper option....then you can spend the rest of the coin on other tools

Originally Posted by Ueee

What exactly do you think you will use one for-just your splines or are there other things in the pipeline? If your thinking of gear cutting then the RT and plates will do you for most of the work. Michael G and i are passing ideas back and forth on an indexing plate capable of 127t gears for members to use. It may not yet happen but it then it might.
If it is just the splines then the indexing plates and a tailstock would be a much cheaper option....then you can spend the rest of the coin on other tools

Thanks Ueee....I dont have anything else in mind other than trying my hand at the splined shaft for the little hi speed waldown

and with more money to spend?....gee dont tell her that tho....definitely earns points that recommendation.

The other option is that if you just want a spline with a set number of grooves making up a clamp block that will allow you to clamp in say 8 orientations?
(Imagine an 8 sided block with a hole up the middle to fit your material)

Michael

Originally Posted by Michael G

The other option is that if you just want a spline with a set number of grooves making up a clamp block that will allow you to clamp in say 8 orientations?
(Imagine an 8 sided block with a hole up the middle to fit your material)

Michael

that means measuring to make the block Micheal...no good for me....if you consider last nights stuff up....(too embarrassed to tell what it was...but lets say I didnt measure right)

for the small cost I will get some plates for the rotary table...it is at this stage only going to be a once off

Originally Posted by pipeclay

I am not sure about divisions but I think 4 holes on a 17 plate will move 2.11 degrees,when you want to be spacing 2.83 degrees abouts.

2.83 deg. is right but I can't show you any math as I use a spread sheet calculator.
It has been right so far but it may well be wrong for 127 holes as I have never tried that yet .