Your chambering guy

[jscandale]

Butch,

How do you hold the reamer, with a center in the tailstock?

JS

 

[wildchild]

wildkid,
I don't use a floater, but if it is indicated properly, drilled, and prebored, what difference would it make. Have you worked in a machine shop?

not woked but you could say ive hung around a few.

 

[wildchild]

I think what windchill is maybe asking is can the chamber ream bigger if the floating reamer is not floating properly. If that is what you are asking, then I think it probably could. Let just say as a hypathetical example, a smith chucked a barrel in a standard 3 jaw chuck and did not indicate the bore. It's probably safe to say that the bore's runout is maybe .010-.020", not to mention the since the bore is cockeyed in relation to the spindle. In this case, and it's a pretty exagerated example, if in addition to such poor setup, the floater was not floating properly, the chamber would certainly cut significantly larger than expected.
If this is not what windchill was asking, then I just wasted a minute of your time...sorry.

JS

if your gunna call me windchill im guna have to call you jscantdoit.

 

[jscandale]

sorry bout that...I just glance at these names.
You can call me what ever you want as long as it ain't late for dinner!

JS

 

[wildchild]

sorry bout that...I just glance at these names.
You can call me what ever you want as long as it ain't late for dinner!

JS

haha ok sounds good. 8)

 

[wildchild]

Ok so whats the concencous of runout tolerance(TIR) in a chamber? As in at what point do ya start over

 

[Switchbarrel]

Ok so whats the concencous of runout tolerance(TIR) in a chamber? As in at what point do ya start over

Sounds like you're tap dancing around an issue...something happen?

 

[wildchild]

Ok so whats the concencous of runout tolerance(TIR) in a chamber? As in at what point do ya start over

Sounds like you're tap dancing around an issue...something happen?

tap dancing in snow boots! Haha
kinda, had 4 chamber jobs done in a floater style and loose chambers, had a few done differantly and off the shelf dies barely size the brass becouse there tight. to sume it up without great detail.

 

[gunsandgunsmithing]

Ok so whats the concencous of runout tolerance(TIR) in a chamber? As in at what point do ya start over

Sounds like you're tap dancing around an issue...something happen?

tap dancing in snow boots! Haha
kinda, had 4 chamber jobs done in a floater style and loose chambers, had a few done differantly and off the shelf dies barely size the brass becouse there tight. to sume it up without great detail.

Reamer prints might be helpful. Do you know that the chambering reamers were proportionately the same size in relation to the dies? As I said earlier, it would be unwise to assume perfection from the reamer or die makers. There are lots of reamers out there that would be better, IMO, if they were a tad bigger in the body. Proper brass sizing is a relationship between the die and the chamber. Which are you assuming to be correct? Keep in mind that they are both made with reamers most often. Why would one automatically assume the factory die was done properly but the custom chamber wasn't? If the chambers were all cut with the same reamer and you're talking about a single die, it would certainly be reasonable to say that the chambers were different, possibly from the floating holder or some other reason.--Mike

 

[gmitchell]

Seams to me some of you guys are offended by wildchilds post. What is better holding the reamer solid like a boring bar after taking your time and indicating the bore the best you can, or indicating the best you can and floating the reamer. Does a thousandth even matter on the neck or body? I think what windchill is trying to say what happens to the freebore if you are going to use a certain bullet? No I am not a machinist, even I know the tolerances will be tighter when the reamer is held tight. Does it matter prolly not. Why spend a bunch of time indicating then float the reamer? I have had the freebore as much as .070 difference when 2 different guys used the same reamer. Mathematically I do understand how this happened. Did both guns shoot good? Yes they did. We can prove what process makes a tighter chamber, can we prove what shoots better? Did any of you guys arguing with windchill have guns that you built winning nationals or doing something really good?

 

[gunsandgunsmithing]

I don't agree that a reamer held in the tailstock will produce a tighter chamber, because the hea and tailstock would have to be in absolute alignment for it to equal a floating holder that works like it should. In fact, that's precisely why we use them. Head and tailstocks don't align perfectly, even on new machinery. Mfgs usually leave them high to account for wear on the lathe bed and bottom of the tailstock...even still, there is no such thing as perfect anyway. And yes, I have built record setting rifles and rifles that have won many matches and finished well in the points. That said, good eguipment is the easy part of the game. ---Mike

 

[jscandale]

I don't agree that a reamer held in the tailstock will produce a tighter chamber, because the hea and tailstock would have to be in absolute alignment for it to equal a floating holder that works like it should. In fact, that's precisely why we use them. Head and tailstocks don't align perfectly, even on new machinery. Mfgs usually leave them high to account for wear on the lathe bed and bottom of the tailstock...even still, there is no such thing as perfect anyway. And yes, I have built record setting rifles and rifles that have won many matches and finished well in the points. That said, good eguipment is the easy part of the game. ---Mike

+1 and ditto on building winning guns. This ain't rocket science, just attention to detail and repetition.
gmitchell noticed that some are offended by wildchild's (aka:windchill, sorry for the mistake) post. I have noticed that too and can't figure out why. I think that some guys here are just always looking for an argument.

JS

 

[wildchild]

Guess some questions are just getting tap danced around for awnsers, i could see why i guess.

 

[butchlambert]

I push my reamer with a flat face tool in the tailstock. I do not want my tailstock to influence the path of my reamer. I want the reamer to follow a prebored hole. I spec my chambering reamer to cut +.003 larger at the base and .002 at the shoulder than my reamer that I use to make my sizing die. If your dies do not size the brass body, you will have chambering and extraction problems. I have tried to ream a chamber with runout, but haven't succeeded.

 

[jscandale]

I push my reamer with a flat face tool in the tailstock. I do not want my tailstock to influence the path of my reamer. I want the reamer to follow a prebored hole. I spec my chambering reamer to cut +.003 larger at the base and .002 at the shoulder than my reamer that I use to make my sizing die. If your dies do not size the brass body, you will have chambering and extraction problems. I have tried to ream a chamber with runout, but haven't succeeded.

The reamer holder that I made for myself works on the exact same principle that you have described in your method, except I have 2 flat faces (one on the reamer, and one in the tail stock) with grease in between the faces to ensure little friction between them and very light spring tension to keep them from falling apart and hands free. It seems to work very well.
Here is a pic:

JS

 

[butchlambert]

Picture of mine. A copy of the old Bald Eagle.

 

[clowdis]

I don't agree that a reamer held in the tailstock will produce a tighter chamber, because the hea and tailstock would have to be in absolute alignment for it to equal a floating holder that works like it should. In fact, that's precisely why we use them. ---Mike

Mike,
I understand what you're saying here, but I indicate the tailstock and only use .100 of the tailstock travel when chambering. That way I stay within the indicated portion of the tailstock travel. I do not use a floating reamer holder because I believe that it can float out of alignment just as easily as it can float into alignment. If the bore is indicated straight and the tailstock is used in a section that has been indicated true then the reamer will follow the bore and ream a straight and tight chamber.

 

[butchlambert]

Gordy,
Please take this in the right vein. You are lost on this. How you have seen it done is probably not the best way either. I understand coming from a layman it looks simple. CNC makes it no more accurate either.

 

[butchlambert]

Do you have spell check, and what do you hold? I suppose that you are an internet machinest.

 

[gmitchell]

Gordy,
Please take this in the right vein. You are lost on this. How you have seen it done is probably not the best way either. I understand coming from a layman it looks simple. CNC makes it no more accurate either.

I did not say it looks simple. I am lost on this, I don't know the proper terminology on all the fixtures and tools. I do know all the flutes on the reamer were cutting and I do know what chambers were tighter. I don't know if it makes a difference how a gun shoots. I do know that if you use those tools in the picture, you are not that far ahead of me. It is a out of control process. When you cut a chamber do all flutes cut?