How would you make these adjacent tapers on lathe

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Talber8
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How would you make these adjacent tapers on lathe

Post by Talber8 » Sun Feb 03, 2019 9:45 am

How would you reproduce this part on a South Bend 9 with no taper adjustment? I need to make a few of them so I’m not sure how to do this consistently with out just hacking into it

I’m picturing using the compound slide, but with the lantern style tool holder how do I know the angle of the tool?

Material is 2” Delrin.

Any tips appreciated!
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Bill Shields
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Re: How would you make these adjacent tapers on lathe

Post by Bill Shields » Sun Feb 03, 2019 11:49 am

using a neutral tool - maybe a 30 degree diamond, and cut it out with a CNC lathe, as there appear to have been done.

otherwise, hog out the center, then set the compound at the correct angle and finish the taper
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Inspector
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Re: How would you make these adjacent tapers on lathe

Post by Inspector » Sun Feb 03, 2019 12:24 pm

I don't have a good answer but welcome to the forum.

Pete

Mr Ron
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Re: How would you make these adjacent tapers on lathe

Post by Mr Ron » Sun Feb 03, 2019 12:49 pm

This looks like a perfect job for soft jaws. Set your compound for the degree taper you want; cut one side then reverse the piece in the chuck and turn the other taper. This way you only have to set the tool post once. You will have to "hog out the center portion before doing the tapers. I think I have it right, but others may want to correct me if I am wrong.
Mr.Ron from South Mississippi

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tornitore45
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Re: How would you make these adjacent tapers on lathe

Post by tornitore45 » Sun Feb 03, 2019 3:28 pm

but with the lantern style tool holder how do I know the angle of the tool?
The angle of the taper is set by the compound slide orientation
The angle of the tool is set by eye to be roughly perpendicular to the taper if possible an not foul other features of the part.
Lantern tool holder has no special distinction in this case, any tool holder need set up the same.

In the end it may be found that to finish the part it need be setting up on a mandrel which can be a threaded rod and a couple of bushings.
Mauro Gaetano
in Austin TX

Talber8
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Re: How would you make these adjacent tapers on lathe

Post by Talber8 » Fri Feb 08, 2019 7:42 am

Think I got it. I have to grind a better tool though that will let me get at to the inside corners better.
Thanks!

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SteveM
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Re: How would you make these adjacent tapers on lathe

Post by SteveM » Fri Feb 08, 2019 8:11 am

Mr Ron wrote:
Sun Feb 03, 2019 12:49 pm
This looks like a perfect job for soft jaws. Set your compound for the degree taper you want; cut one side then reverse the piece in the chuck and turn the other taper. This way you only have to set the tool post once. You will have to "hog out the center portion before doing the tapers. I think I have it right, but others may want to correct me if I am wrong.
I agree. Only have to set the compound once and both tapers will match.

Use a live center to support the other end, otherwise it might walk out of the chuck - there's a limit to how tight you will be able to hold it as compared to metal.

Steve

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Re: How would you make these adjacent tapers on lathe

Post by Conrad_R_Hoffman » Sun Feb 17, 2019 2:09 pm

Fortunately it's Delrin, as you'll have to have the tool hanging out a ways.
Conrad

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