update: rigid reamer holder

[Taylorbok]

all great points @LVLAaron, for now I'm gonna stick with the floating reamer holder but it is something I would like to try at some point, even if it's just for knowledge sake.

Might learn something useful from the process even if a person chooses not to continue doing it that way.

 

[WSnyder]

This is the kit that Drews came up with. He has a bunch of videos on it. Its pretty clever.

Omni Adjustable Rigid Reamer Holders | Manson Precision Reamers

Discover the Omni Adjustable Rigid Reamer Holder from Manson Precision Reamers — a USA‑made, lathe‑carriage mountable tool offering precise X/Y and angular adjustments for perfectly aligned, chatter‑free chamber reaming. Achieve zero run‑out, repeatable results, and superior stability every...

mansonreamers.com

$800??? I think I’ll stick to my nearly free pusher. I’ve got what? 20 minutes of labor into making it?

 

[tobnpr]

$800??? I think I’ll stick to my nearly free pusher. I’ve got what? 20 minutes of labor into making it?

I wouldn't want it for free...really.
I have a lot of Manson tooling, but this is a solution in search of a problem IMO.
Why would I want to double the workload (dialing the barrel, AND the reamer) when I'm already getting zero chamber TIR?

Besides, nowhere to mount it on my saddle. The entire cross-slide beyond my compound is a cover all the way to the taper attachment, far from rigid enough to mount a tooling block.

 

[Jud96]

I’m not a fan of rigid reamer holders. I think too many variables have to be perfect. Then having to dial in the reamer with some rigid setups to make sure it’s right is a whole other extra issue. Yes there’s flex in the reamer and movement in the tailstock quill so there’s some “give” when rigid reaming off a tailstock. If using the tailstock I see no reason not to use a pusher though.

On a CNC, I’m liking the Soma floating holder I’m using on the tool post. Kennametal and others make something similar. The Soma is very well built and fully adjustable for the amount of allowable movement and independently adjustable for the amount of angular movement. I set mine up so it’s repeatedly within .001 on center and height. So all its correcting for is that minor amount. It also returns to center within .0005 so it doesn’t “drag” when power feeding in and out of the chamber.

I personally think guys are seeing chatter and other issues when CNC chambering because of their setup, speeds and feeds, pre-drill/pre-bore methods, etc.

 

[LVLAaron]

I’m not a fan of rigid reamer holders. I think too many variables have to be perfect. Then having to dial in the reamer with some rigid setups to make sure it’s right is a whole other extra issue. Yes there’s flex in the reamer and movement in the tailstock quill so there’s some “give” when rigid reaming off a tailstock. If using the tailstock I see no reason not to use a pusher though.

On a CNC, I’m liking the Soma floating holder I’m using on the tool post. Kennametal and others make something similar. The Soma is very well built and fully adjustable for the amount of allowable movement and independently adjustable for the amount of angular movement. I set mine up so it’s repeatedly within .001 on center and height. So all its correcting for is that minor amount. It also returns to center within .0005 so it doesn’t “drag” when power feeding in and out of the chamber.

I personally think guys are seeing chatter and other issues when CNC chambering because of their setup, speeds and feeds, pre-drill/pre-bore methods, etc.

Got a part number for that soma?

 

[Jud96]

Got a part number for that soma?

Somma SS075ERFC20-1

 

[tobnpr]

Somma SS075ERFC20-1

I remember looking at that a few years back, all straight shank- no MT for a tailstock.

 

[Sniperhandle]

I wonder how many people had to make their barrels shorter after trying the rigid setup?

 

[LVLAaron]

I remember looking at that a few years back, all straight shank- no MT for a tailstock.

Yeah. Would require some handy work to make it fit an MT tailstock.

 

[Jud96]

Buy one of these MT3 blanks and bore it 3/4” straight 1.82” deep (length of the Somma shank plus a little). Then mill down the top and drill it tap it for a couple set screws so you can lock the reamer holder into the Morse taper blank. That’s not much of an undertaking.

The boss on the MT3 blank is 32mm long (1.260”) so you’d only have about .550” of bore past the straight shank section and into the taper section. On an MT3 the large end of the taper is around 1” so the 3/4” bore being .550” deep wouldn’t be an issue.

Soft Blank End Arbor 3MT Morse Taper MT3 Flat Type 32mm x 32mm Lathe Mill Drill | eBay

MT3 BLANK END ARBOR - 32mm. Shank - MT3. Shank Taper is MT3 with Flat End and Front End is Dia. 32mm and is 32mm long. Ground precisely on studer cnc grinder and taper is inspected by air gauges for maximum accuracy.

ebay.us

 

[ELR LVR]

We used something like this in the CNC world
you guys hip to these?
I forget what brand we used but it was for tiny little taps like down to 2-80
so they would not break or get bound in any stress
floating in and out under spring tension
as well as up and down and all around

 

[skeetlee]

I bored one after talking with Gavin about it. It held for a couple months. Once winter came my floors moved and I had to re level my machines and I couldn’t ever get the reamer co axial like it had been. It was close but not perfect. I did cut a few 22lr chambers with the set up and I had the best finishes to date while using it. I think the idea is good if your situation is sound.

 

[LVLAaron]

My three cents.

I got a PTG reamer holder. They are the best. They are similar in design to the somma, kennametal, etc floating holders. Moves in all 3 axis. I prebore and get the chamber started, and then the best part of the holder is you can tighten the collar that holds it all together while the reamer is in the chamber.

Boom. Hybrid floating semi-rigid holder. It really makes a big difference with those fidgety carbide reamers.

They are hard to get a hold of. We should do a group buy and maybe we'd get them before the next presidential election.

 

[Jud96]

My three cents.

I got a PTG reamer holder. They are the best. They are similar in design to the somma, kennametal, etc floating holders. Moves in all 3 axis. I prebore and get the chamber started, and then the best part of the holder is you can tighten the collar that holds it all together while the reamer is in the chamber.

Boom. Hybrid floating semi-rigid holder. It really makes a big difference with those fidgety carbide reamers.

They are hard to get a hold of. We should do a group buy and maybe we'd get them before the next presidential election.

Or maybe have a more reliable source make them. I won’t give PTG any business given their reputation for the past 10+ years.