Boring Head for Cutting Tenons

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builtbybill

builtbybill

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Joined
Dec 17, 2014
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Clayton, NC
Hello,

I was just wondering if anyone has used/modified a boring head (https://a.co/d/83oNfK7) to cut the tenons for threading? I was thinking I could get some 1/2" stock and make a short holder for a carbide cutter so this could also be used to cut tenons, and use the included bits for boring materials. Just trying to kill two birds with one stone, I could use this to bore rings and cut tenons for pens.

TIA
 
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dschem said:
Kinda sounds like a similar idea to the Hinze tenon cutter. That may give you some ideas
Click to expand...
The Hinze cutter is 3x the price (probably worth it if you sell pens) and cannot bore internal holes (i.e., rings). I am sure my idea will have some drawbacks, but I think it "should" work.
 
I had the same boring head. I found it a bit trying to turn tenons with it. Maybe I didn't understand how to make tenons using it. I use the Hinze tenon cutter for tenons and drill bits for holes for threading. Sold my boring head kit.
Do a good turn daily!
Don
 
its_virgil said:
I had the same boring head. I found it a bit trying to turn tenons with it. Maybe I didn't understand how to make tenons using it. I use the Hinze tenon cutter for tenons and drill bits for holes for threading. Sold my boring head kit.
Do a good turn daily!
Don
Click to expand...
As it comes the only way to cut tenons would be to run the lathe in reverse, not a good idea, because of the cutter's edge. If I was to make a short carbide cutter I could put the cutting edge on the correct side, the only concern is that I will not have the "guide rod", that goes into the center of the blank, to help stabilize the cutter.
 
I made a tool for my boring head that uses round carbide inserts, I use it to make balls for the handles on my Sliding er32 collet chuck but it should work for tenons.

IMG_9294.JPG
IMG_9298.JPG


PM me if you're interested.
 
rherrell said:
All you need is the cutter, not the whole set-up. You don't need your boring head to rotate to cut a tenon.
Click to expand...

So... If I'm tracking, to use the boring head to cut a tenon, you would just need a carbide cutter holder that will hold a square cutter. Right?
 
d_bondi said:
So... If I'm tracking, to use the boring head to cut a tenon, you would just need a carbide cutter holder that will hold a square cutter. Right?
Click to expand...
That's what I am thinking, with the cutting edge on the opposite side of the ones that come with it. The cutting edge on the included bits is on the left, for cutting inside a hole, for cutting a tenon, on the outside, the edge needs to be on the right side of the bit. Maybe this is not even worth it, might be better off just doing it the manual way...I will probably still try it because I want the boring head for making rings.
 
OK, I did a little experimenting and here is what I found...

The round cutter works but it leaves a poor finish...
IMG_9681.JPG


Next I tried a standard boring head cutter and it leaves a good finish...
IMG_9682.JPG


The only inserts I had were for steel, if I had used a positive rake insert the finish would have been better. The standard boring bar cutter needs to be used on the back side with the lathe run in reverse but that's not a big deal.

Conclusion... A standard boring bar will work much better than the round cutter. If you use a boring bar like mine you'll need some positive rake inserts for the best finish, HERE are some on Ebay. The important number is TCGT 21.50 (could also use 21.51).

HERE is a link to a boring bar like mine.
 
rherrell said:
OK, I did a little experimenting and here is what I found...

The round cutter works but it leaves a poor finish...
View attachment 387947

Next I tried a standard boring head cutter and it leaves a good finish...
View attachment 387948

The only inserts I had were for steel, if I had used a positive rake insert the finish would have been better. The standard boring bar cutter needs to be used on the back side with the lathe run in reverse but that's not a big deal.

Conclusion... A standard boring bar will work much better than the round cutter. If you use a boring bar like mine you'll need some positive rake inserts for the best finish, HERE are some on Ebay. The important number is TCGT 21.50 (could also use 21.51).

HERE is a link to a boring bar like mine.
Click to expand...
Very nice Criterion boring head.
 
rherrell said:
OK, I did a little experimenting and here is what I found...

The round cutter works but it leaves a poor finish...
View attachment 387947

Next I tried a standard boring head cutter and it leaves a good finish...
View attachment 387948

The only inserts I had were for steel, if I had used a positive rake insert the finish would have been better. The standard boring bar cutter needs to be used on the back side with the lathe run in reverse but that's not a big deal.

Conclusion... A standard boring bar will work much better than the round cutter. If you use a boring bar like mine you'll need some positive rake inserts for the best finish, HERE are some on Ebay. The important number is TCGT 21.50 (could also use 21.51).

HERE is a link to a boring bar like mine.
Click to expand...
Rick,
Thank you so much for all of your help.
 
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