Rotary table question.

[larry phelan 1Participant @larryphelan1]

Good day all,

I wish to make a plate for my r/t to give 14 holes. { 90 t0 1 }

I have made a plate from the existing  “B” plate which gives the correct number of holes. What I want to know is, how do I use this second plate to  drill the job ?

I am missing out on something here, but what ?

Please excuse if this is a stupid question.

I seem to remember reading about making a plate from an existing one in order to make it more accurate.

What am I doing wrong ?

[Dave SParticipant @daves59043]

I’m not totally clear in what you have done, but I think the answer is you need to put the new plate onto the index position and then just use it.

 

Dave

[BazyleParticipant @bazyle]

You don’t often need to make a second more accurate plate unless your first is made by drilling randomly while drunk. The process improves accuracy by the factor of the worm but that applies when making the job too so probably going to be accurate enough. Presumably you did 6 turns and 9 holes on a 21 hole plate.
If you want the trouble of mounting and using your 14 hole plate you now do 6 turns and 6 holes – you have reduced your number of plate holes from 21 to 14 so 2/3 the number so the final rotation is 2/3 of 9 ie 6.
happy counting.

useful link
https://www.cgtk.co.uk/metalwork/calculators/dividing

 

[larry phelan 1Participant @larryphelan1]

Thank you Dave, that,s exactly what I did, but I  was not sure how many turns to go or how many holes to use. I think  Bazyle,s reply is more helpful since that is what I actually did. I think my mistake was that I did not know about reducing the number of holes. We live and learn [sometimes ]

I will have another go at it later. In the meantime, thank you both for replying, as they say “Every little helps “

[larry phelan 1Participant @larryphelan1]

Just an update to the above, I have just done another “Test Run ” to check where I went wrong. I was expecting to get 14 holes right away, but of course it does not work that way, you still have to make 6 full turns plus so many holes. This time round, I followed Bazyle,s advice but copped on that I needed 6 Spaces, not 6 holes !

The result was Success !!!

So, thank you both, once again.

[Martin ConnellyParticipant @martinconnelly55370]

It is still six as the hole count but you have to remember that the starting hole is zero, just like the end of a steel rule is zero but mostly people don’t think about that because it is not usually marked with a zero.

Martin C

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