Author Topic: Indexing  (Read 2295 times)

Offline airmodel

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Indexing
« on: January 31, 2014, 05:18:48 AM »
Hi everyone
I do not have indexing equipment in my workshop so I thought why not use the jaws of a three jaw chuck to index three holes I wanted to drill in a turbine. An adapter was made so a electric drill could be mounted in the tool post of my lathe and was used to drill the three holes in the turbine.

This method could be useful to someone not having a lot of accessories in their workshop.

The video shows how it was done.http://youtu.be/cQHBzCAmsqE   

 Another useful thing to have is a temporary faceplate so holes can be drilled where ever they are needed. I find that the slots in the faceplate that came with the lathe are never in the right place.

Bill

Offline Roger B

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Re: Indexing
« Reply #1 on: January 31, 2014, 08:08:51 AM »
I have used a similar technique with a block under one of the jaws which can be used for 3 or 4 holes depending on which chuck is fitted. The picture is making a collet extractor for a mini lathe, a similar setup was used to drill the clamping/releasing holes for the tapered bush in the flywheel of my vertical engine.
Best regards

Roger

Offline steamer

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Re: Indexing
« Reply #2 on: January 31, 2014, 10:22:08 AM »
My 5C collet chuck has a 24 position index ring that I can zero out.   It comes in really handy with the filing rest!









"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline airmodel

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Re: Indexing
« Reply #3 on: January 31, 2014, 10:10:46 PM »
Roger B
steamer

It is good to see how we all think alike. 

Offline Ramon

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Re: Indexing
« Reply #4 on: January 31, 2014, 10:54:43 PM »
Now that really is a good looking filing rest Dave  :ThumbsUp: - one day perhaps I'll actually find time to make a proper one and finally bin the jury rig job  ::)

Ramon
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline Bezalel

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Re: Indexing
« Reply #5 on: February 01, 2014, 12:07:55 AM »
Thats a handy trick to remember Bill.
 
 
It immediatey sparked my curiosity about how would I go about finding other prime numbers above 3 without an indexer on any typical bench lathe.
 
Numbers like 5, 7, 9 or even 13 might be challenging 
 
Say we want 5 divisions
 
Set the lathe to the coursest pitch thread -(lets make it 1-3/4"UNC)= 5 tpi on my charts
 
Calculate  1000/(tpi x Divs)       =   1000/(5 x 5) = 40
 
When a micrometer or dial indicator shows the carrage has moved 40 thou, the spindle will have rotated 1/5th of a revolution.
 
If your change wheels are set for a metric thread, use the formular     
 
pitch mm/Divs = carrage movement mm   ;)
Ramon
when you work out where to find time, keep it a secret, you won't want to get killed in the rush. :Jester:
 
 
Bez
 
 
Queensland - wet one day, humid the next

Offline pgp001

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Re: Indexing
« Reply #6 on: February 01, 2014, 12:19:09 AM »
Bez

You keep your time in the same place as your "round tuits"

Phil