Long Boring Head

Hi folks :)

So my workshop is finally equipped enough to get a start on making the things I put it together for. Unfortunately, my small lathe's toolpost won't take boring bars with the kind of girth I'd like, so I opted to make a long boring head I can use in my ER32 collet chucks:
https://i.loli.net/2018/04/25/5ae06be65089d.jpg
https://i.loli.net/2018/04/25/5ae06be5581b2.jpg

The head is nothing special and was a simple turning job, though the finish on the head might make one or two of you wince a little but was done on purpose for artistic flair. I'veworks copper and did a fair amount of smithing in my youth and surface texture has always been an interest of mine. It occured to me while turning the head that it wasn't a critical surface so thought I'd see what controlled chatter could do. Though it's a bit uneven as I was testing it out for the first time.


Canobi

I prefer girth over length myself, also.

This thread is boring.


https://4.bp.blogspot.com/-VYzmk5x3f...lmao_super.jpg

You'll wind up with a lot of these. Most used are thru-hole as what you present here, along with flat bottom, and recessing. With correct bits they'll do more than bore; threading, snap and O-ring grooves, undercutting, etc.

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Thanks Canobi! We've added your Long Boring Bar to our Machining category,
as well as to your builder page: Canobi's Homemade Tools. Your receipt:

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Quote:

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Originally Posted by Toolmaker51

You'll wind up with a lot of these. Most used are thru-hole as what you present here, along with flat bottom, and recessing. With correct bits they'll do more than bore; threading, snap and O-ring grooves, undercutting, etc.

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I hadn't considered using one for those operations, thanks for the tip :)

Hi folks :)

I finally gave the tool a good test run. I used it to cut a radial slot in a part for my next build project (a keyway slotting attachment). I ground a new egde on the other side of the bit too as the original profile is far more suited to cutting internal grooves (as mentioned by toolmaker51).

The new profile needed a regrind, my initial tast was on aluminium and it worked amazingly but the radii was too big for steel. It also took me a while to find the right feed n speed for the tool. I was treating it like a fly cutter at first and had been cranking the carriage leadscrew by hand, being that it only has one tooth but discovered I've actually made a real metal munching monster, which is only limited by my small lathes meagre capability.

https://youtu.be/8zZ3UpuJr-Q


New profile prior to regrind:
https://i.loli.net/2018/06/05/5b16602f5033e.jpg

Initial test cut in alu:
https://i.loli.net/2018/06/05/5b1660312e181.jpg