rscott9399
Plastic
- Joined
- Jan 19, 2022
Hey all
So amateur hobbyists here with a fundamental lathe question that I have not been able to get answered through good old YouTube surprisingly.
I tend to work with a lot of old junk metal for practice. Most times there is a scale on the outside and the part is hardly ever round.
I am going to put forth a scenario and then explain what I am seeing and you all tell me what my best course of action is please.
So say I have some material that longish. 12-18 inches or so. Maybe 1.5 inches OD with an outside scale and isnt round.
I have a lathe with a 1.25 inch spindle bore. No steady rest. How do I true up the material?
I have tried so many things and cant get it to work.
My normal procedure has been, get as much in the chuck as I can. I have both a bison 3 and 4 jaw. Tried both doesn't make a difference.
I obviously cant do much in the way of centering the 4 jaw because the part has a scale on the outside and getting the 4 jaw indicated is impossible with the needle jumping all around. The first thing I have been doing is going to the far end of the work piece. Which sucks because that is where I have the most deflection. I cant drill a center hole for the tail stock yet because the dang part won't spin true and if I do it now it won't actually be the center. So I usually move to the far end and very carefully and gently take of the outside scale usually .005 at a time. Which takes for ever. If the part is very small diameter its a nightmare because of the deflection even with .005 DOC.
Once I machine a new surface, ill take the part out and flip it over and put the machined surface I just made in my jaws. This allows me to true up the jaws and the part at least very close to the chuck. The far end will still be wobbling all over.
Once I get to this point sometimes I try to gently drill a center to I can finally get the damn tailstock in and then I clean up the piece for real.
However, the issue im having is, TAPER!!!
Because of this wack procedure I'm doing, the center drill never is actually in the center. So when I put the tail stock in its usually not perfect. and then im stuck with taper on the part for forever because no matter how badly I try to get it out I never can.
If the part would fit in the spindle bore I would stick it far far in so I could get a proper center with no deflection.
So the issue seems to lie with the following problem.
Spindle bore to small. Material is junk yard rust crap stock and I am a rookie.
Can someone suggest a procedure to help me? I am tired of my parts having taper. I have a machine capable of holding 10ths over feet however my setup is all wrong.
I am running on a fryer easy turn CNC with sinumerick control. I use it manually with the exception of single point threading.
any help much appreciated.
So amateur hobbyists here with a fundamental lathe question that I have not been able to get answered through good old YouTube surprisingly.
I tend to work with a lot of old junk metal for practice. Most times there is a scale on the outside and the part is hardly ever round.
I am going to put forth a scenario and then explain what I am seeing and you all tell me what my best course of action is please.
So say I have some material that longish. 12-18 inches or so. Maybe 1.5 inches OD with an outside scale and isnt round.
I have a lathe with a 1.25 inch spindle bore. No steady rest. How do I true up the material?
I have tried so many things and cant get it to work.
My normal procedure has been, get as much in the chuck as I can. I have both a bison 3 and 4 jaw. Tried both doesn't make a difference.
I obviously cant do much in the way of centering the 4 jaw because the part has a scale on the outside and getting the 4 jaw indicated is impossible with the needle jumping all around. The first thing I have been doing is going to the far end of the work piece. Which sucks because that is where I have the most deflection. I cant drill a center hole for the tail stock yet because the dang part won't spin true and if I do it now it won't actually be the center. So I usually move to the far end and very carefully and gently take of the outside scale usually .005 at a time. Which takes for ever. If the part is very small diameter its a nightmare because of the deflection even with .005 DOC.
Once I machine a new surface, ill take the part out and flip it over and put the machined surface I just made in my jaws. This allows me to true up the jaws and the part at least very close to the chuck. The far end will still be wobbling all over.
Once I get to this point sometimes I try to gently drill a center to I can finally get the damn tailstock in and then I clean up the piece for real.
However, the issue im having is, TAPER!!!
Because of this wack procedure I'm doing, the center drill never is actually in the center. So when I put the tail stock in its usually not perfect. and then im stuck with taper on the part for forever because no matter how badly I try to get it out I never can.
If the part would fit in the spindle bore I would stick it far far in so I could get a proper center with no deflection.
So the issue seems to lie with the following problem.
Spindle bore to small. Material is junk yard rust crap stock and I am a rookie.
Can someone suggest a procedure to help me? I am tired of my parts having taper. I have a machine capable of holding 10ths over feet however my setup is all wrong.
I am running on a fryer easy turn CNC with sinumerick control. I use it manually with the exception of single point threading.
any help much appreciated.