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Old 10-21-2018, 08:37 PM
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milomilo milomilo is offline
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Default Lathe indexing tool

I have had a need to accurately index a round item and I do not have a mill, so saw this on YT and thought I would make one.

It uses a quick attach AXA boring bar tool holder. Made a brass sleeve to fit the hole on a tool holder 3" long. Then drilled a 3/8" hole in it. Then made a 3/8" rod about a foot long that fits in the 3/8" brass sleeve. Threaded the end 3/8"-24 for a 3/8" chuck I had laying around. Put a drop of lock tight on the threads. Next is to make three flats to use a cordless drill to spin the 3/8" rod.

Now in a quandary on to how to make three flats 120 degrees apart on the 3/8" rod. Guess I will use the chuck to index the jaws on my chuck to file the flats. It may not be super accurate but ought to be close enough. I will do the flats tomorrow. I have to make a standoff 3 5/8" long to sit under the chuck jaw and the lathe bed. Just have to make sure my file is flat when doing each of the filings for each flat.

More tomorrow when I am finished. Will make a new thread on using it to make a spider for the lathe.
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Old 10-21-2018, 09:30 PM
Lew Hartswick Lew Hartswick is offline
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I don't see how this does indexing. I interpret that to mean turning the spindle by uniform increments. What does the chuck in the tool holder have to do with that?? How about a link to the YT that you watched??
...lew...
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Old 10-21-2018, 10:31 PM
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milomilo milomilo is offline
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Quote:
Originally Posted by Lew Hartswick View Post
I don't see how this does indexing. I interpret that to mean turning the spindle by uniform increments. What does the chuck in the tool holder have to do with that?? How about a link to the YT that you watched??
...lew...
Here is the link.
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Old 10-22-2018, 05:37 AM
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It makes more sense now after the video. I can see that coming in handy. And you could use the carriage to help put pressure on the chuck when drilling if need more pressure like a drill press.
Next you will need to make in indexing head for the outboard part of lathe headstock like Video OP suggested.


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Old 10-22-2018, 07:19 AM
Lew Hartswick Lew Hartswick is offline
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OK the tool you are doing is the tool post drill. The "Indexer" he used is just the stick between the chuck jaw and the bed. :-) NOW that is some indexer. If all you ever need is 120 deg. :-)
The only problem I see with that tool post drill is getting the axis aligned dead parallel with the spindle axis. Maybe "close" is close enough for most work.
...lew...
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Old 10-22-2018, 10:44 AM
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Quote:
Originally Posted by Lew Hartswick View Post
OK the tool you are doing is the tool post drill. The "Indexer" he used is just the stick between the chuck jaw and the bed. :-) NOW that is some indexer. If all you ever need is 120 deg. :-)
**
The only problem I see with that tool post drill is getting the axis aligned dead parallel with the spindle axis. Maybe "close" is close enough for most work.
...lew...
If there is a willingness there is a way to get other than 120 deg.
some math along with the proper blocks heights..

As for alignment,
an indicator with a Mag base will get you right on.

I see locking the lathe spindle more of a problem..
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Old 10-22-2018, 12:39 PM
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Quote:
Originally Posted by toprecycler View Post
It makes more sense now after the video. I can see that coming in handy. And you could use the carriage to help put pressure on the chuck when drilling if need more pressure like a drill press.
Next you will need to make in indexing head for the outboard part of lathe head stock like Video OP suggested.


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A head stock indexer is the plan.

Quote:
Originally Posted by Lew Hartswick View Post
OK the tool you are doing is the tool post drill. The "Indexer" he used is just the stick between the chuck jaw and the bed. :-) NOW that is some indexer. If all you ever need is 120 deg. :-)
The only problem I see with that tool post drill is getting the axis aligned dead parallel with the spindle axis. Maybe "close" is close enough for most work.
...lew...
I plan on locking the drive in some manner.

Quote:
Originally Posted by GWIZ View Post
If there is a willingness there is a way to get other than 120 deg.
some math along with the proper blocks heights..

As for alignment,
an indicator with a Mag base will get you right on.

I see locking the lathe spindle more of a problem..
I do have a mag degree gauge for other degrees.
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Old 10-22-2018, 04:48 PM
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Quote:
Originally Posted by milomilo View Post
A head stock indexer is the plan.


I plan on locking the drive in some manner.
You have a belt drive headstock, so leave it in direct and engage the backgear lever, it's locked.
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  #9  
Old 10-23-2018, 05:52 PM
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You have a belt drive headstock, so leave it in direct and engage the backgear lever, it's locked.
I tried that but there is still a slight wiggle at the chuck. Tomorrow I will drill the spider and see if I just put a little pressure on the chuck and it stays still while drilling.
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  #10  
Old 10-23-2018, 07:55 PM
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Put your mag drill on the compound and mill the flats
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