T
Tim Mn
Guest
What rpms are you guys using to chamber barrels? Does it change when going from cm to ss?
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Reaming CM vs SS
Tim:
If you are working center to center with a steady rest you will be turning such low rpms that CN or SS is really is not a factor.
If you are using a center bearing setup or through the headstock again you are going to need to be reaming with a speed and feed that will not cause chatter. Experience is the best teacher.
I personally use a highpreasure flush system and only use piloted reamers. With calibers 22 and smaller I have to slow my system down sometimes to 25rpms. With calibers 22 and larger up to 35 caliber, I can run any where between 70 and 300 RPMS. But that is running 35-100 psi of coolant.
If you talk with Dave Kiff, and Dave Manson they will tell you the highest cutting speed and the lightest feeds with high presure coolant will give you the best chambers as long as you can control your tooling. You want your reamer to cut not grind out the chamber.
There are several schools of though on this subject and you will get varied responses.
Nat Lambeth
Tim:
If you are working center to center with a steady rest you will be turning such low rpms that CN or SS is really is not a factor.
If you are using a center bearing setup or through the headstock again you are going to need to be reaming with a speed and feed that will not cause chatter. Experience is the best teacher.
I personally use a highpreasure flush system and only use piloted reamers. With calibers 22 and smaller I have to slow my system down sometimes to 25rpms. With calibers 22 and larger up to 35 caliber, I can run any where between 70 and 300 RPMS. But that is running 35-100 psi of coolant.
If you talk with Dave Kiff, and Dave Manson they will tell you the highest cutting speed and the lightest feeds with high presure coolant will give you the best chambers as long as you can control your tooling. You want your reamer to cut not grind out the chamber.
There are several schools of though on this subject and you will get varied responses.
Nat Lambeth
J
Jkob
Guest
A whi;e ago, perhaps a few years, I was getting chatter with some of my reamers. I was not able to understand why. I would continually slow down my RPS to as low as I could get to no avail. It would be necessary then to bore the chatter out, using the compound set to the correct taper and a small borring bar. SOmewhere along the line I decided it was worth a try to speed it up a bit. Oh how the light came on!!! I have not had a chatter problem since. I use a Jet 13x40 belt drive and determined that the slow speed was causing the chatter in the belts. WIthout checking the lathe in the shop, I would think I chamber between 120 and 240 RPM's depending on the reamer's size, smaller meaning a bit slower and not much difference between CM and Stl.
Mr Lambeth, for you. Your flush system at 100 PSI or less; how do you keep the fluid from squirting all over the place/
Mr Lambeth, for you. Your flush system at 100 PSI or less; how do you keep the fluid from squirting all over the place/
Last edited by a moderator:
Catching that coolant..
Jim:
I use a Pop bottle with the bottom cut out. I stick the reamer shaft through the bottle neck into my floating reamer holder. I use a Lambeth-Kiff Micrometer Adjustable Reamer holder that is on the inside of the bottle/cone.
I took a plastic container (I can't beleive it not butter) and made a hole in the bottom with cuts around the edge so it will slip over the "tenon" and push it up against the chuck laws. I have a bread pan with a 1." drain hose back to my coolant tank. I have a couple of earth magnet in my bread/catch pan to pickup and hold the chips.
Now things get real exciting if I have a hose blow off the muzle end of the barrel. I am using Rustlic 255R cut to 5:1 which is a chlorine water base extreme presure coolant.
The have bee several post of my system in this site , 6mmBR, Home shop Machinist and Practical Machinist. If you want I will e-mail you some pictures.
Nat Lambeth
Jim:
I use a Pop bottle with the bottom cut out. I stick the reamer shaft through the bottle neck into my floating reamer holder. I use a Lambeth-Kiff Micrometer Adjustable Reamer holder that is on the inside of the bottle/cone.
I took a plastic container (I can't beleive it not butter) and made a hole in the bottom with cuts around the edge so it will slip over the "tenon" and push it up against the chuck laws. I have a bread pan with a 1." drain hose back to my coolant tank. I have a couple of earth magnet in my bread/catch pan to pickup and hold the chips.
Now things get real exciting if I have a hose blow off the muzle end of the barrel. I am using Rustlic 255R cut to 5:1 which is a chlorine water base extreme presure coolant.
The have bee several post of my system in this site , 6mmBR, Home shop Machinist and Practical Machinist. If you want I will e-mail you some pictures.
Nat Lambeth