Dividing heads and dividing by 12…

[Howard LewisParticipant @howardlewis46836]

One of the advantages of a plate with more holes is that the effect of any errort is reduced.

A slight positional error on a 12 hole plate will result is an error of twice the magnitude of that for ther same error with a 24 hole plate, at the head of the Dividing Head or Rotary Table, even if it reduced by the gear ratio of the particular device being used.

As for “direct from brain to keyboard with no filter”, ERROR. I have read the thread from the start, several times.

I spent a lot of time thinking about how to help the OP, rather than pouring scorn on those who are trying to find the detailed method to provide a solution.

DC31k did you provide any detail as to how the divisions could be produced, other than the generalisation of suggesting the use of plates with hole numbers divisible by 6?

I thought that ine of the objects of this Forum is to provide advice and help to those seeking it.

Not all on here are experts, hence the requests for help, which will, in some cases, require details of the tooling, operation sequence, and methods used, to achieve the object.

Howard

 

[timdotdParticipant @timdotd]

Folks, please, I didn’t intend for this thread to get quite so heated…!

Thanks for all the input – with the aid of calipers, Fusion360 and a bit of assistance from Claude I was able to print off (on the fourth attempt) a plate to fill in the missing ratios (according to Claude the addition of 22, 24, 25 and 26 will handle all but some very strange divisions).

It’s obviously not as robust as a machined version would be, but OTOH the concentricity is guaranteed to the accuracy of a Bambu A1 (ie better than this human would be able to achieve).

Should anyone need it in the future, here’s the Fusion360 and STL files – it would be a very simple operation to change the hole patterns if these aren’t the right ones.

(And a mental note for next time – having access to a 3D printer makes for very rapid prototyping, and hopefully fewer wasted chips…)

[Howard LewisParticipant @howardlewis46836]

Glad that you now have the means of filling in the gaps; and producing your required 96 divisions.

It looks as if the Forum has provided some help in achieving what you wanted to do.

And your experiences will be of help to others when faced with a similar problem!

Howard

[timdotdParticipant @timdotd]

So far, so good!

[Author]

Posts