Chamber from toolpost?

[kasperbunk]

Anyone drilling tobacco chamber with toolbit in the toolpost? Anyone who could recommend a shape on the tool. If you look on the video of “Former makes a billiard” https://youtu.be/YxVodOHo1Nw
1.50min. you see him drilling from the toolpost. Looks easy. I am having trouble with drilling large diameter from my tailstock. Maybe it’s an alignment issue!


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[UnderShade]

Former makes everything look easy...

I wondered about that bit also. Not sure why (other than convenience and expediency) one would drill from the tool post. I’d definitely check the alignment of my tailstock or the condition of your drill bits/chuck if you’re having troubles.

[KurtHuhn]

That's essentially a boring bar. It only cuts from one side, and allows you to make the chamber as wide as you need it without having to have a drill bit of the exact size you need. They are very easy to make - all you need is some square stock (or round, depending on your toolholder) and a grinder. It's fast and accurate, and not prone to wobble and binding as some drill bits can be.

[kasperbunk]

Kurt do you maybe have an example to show?


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[kasperbunk]

Could I make one from a spade bit?


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[KurtHuhn]

Could I make one from a spade bit?

Kurt do you maybe have an example to show?

Yes - I'll dig one out and take a pic. I also have a need to make one (I changed my toolpost recently, and this video reminded me), and I can take video of that process.

I would NOT make one from a spade bit.The shanks on spade bits are too flexible (they're designed to flex) and won't be rigid enough. There's also the problem of holding the round shank securely enough to not spin. You really want to make these from 3/8" or larger square tool bits - either M2 or M42 tool steel.

[kasperbunk]

A video would be awesome!


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[UnderShade]

That makes total sense Kurt. Would love to see a video as well!

[LatakiaLover]

Not a pipe maker, the me, but I always wondered why all the ones I've known who were not "shape first THEN drill" guys had a large assortment of chamber bits, when cutting from the side is so much more flexible, faster, and less expensive. Charatan did it, so it's not even a Scandinavian thing.

[n80]

I'm assuming the block of wood he inserted at the base was his depth gauge. I bet he had one for every pipe shape.

[DocAitch]

I approach chamber sizes and shapes from a different start point. I am a shape first then drill maker.
Although I have a dozen chamber bits of varying sizes and shapes, I generally make all of my chambers the same smaller size and when I have fixed on the final outer shape, adjust the size of the chamber larger with sanding mandrels using 60-80 grit paper.
The mandrels are simple oak dowels shaped on the lathe with a slit to accommodate the sand paper and which vary in size and chamber shape to conform to the outer dimensions of the pipe bowl. These are chucked in the lathe for use.When the final chamber dimension is reached, I can then use finer grits on the same mandrel to finish the chamber.
Premal Chheda carries a line of mandrels made from metal which do the same thing.
DocAitch

[oklahoma red]

When watching this video, take note of the fact that his chamber tool is probably sharp enough to shave with. That makes a HUGE difference in the quality of the chamber finish and greatly reduces the effort to use it.
I'll also throw this out to Kurt: would a spoon bit achieve the desired result as it is essentially a one-edged reamer? Just step it over on successive cuts.

[KurtHuhn]

I'll also throw this out to Kurt: would a spoon bit achieve the desired result as it is essentially a one-edged reamer? Just step it over on successive cuts.

Hmm. Maybe. I don't think I would do that though. The relief angle on the underside of the cutter needs to be more pronounced than a spoon bit. Spoon bits are designed to ride the chamber walls for support during freehand drilling, and that lack of relief could (probably will) negatively impact them when stepped over .020" to expand the chamber size. It could work - I just have a bad feeling about it.

And I apologize - I meant to get some pics snapped and some video taken this past weekend of grinding a chamber bit like Former's, but ran out of time. I'll get it done this coming weekend.

[kasperbunk]

Did you make a video Kurt?


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[KurtHuhn]

I just posted it in the tools section:
viewtopic.php?f=43&t=12198