I saw a thread on here (can't find it now) about making a set true ER 40 Collet chuck. I got to thinking, that is exactly what I need to solve a problem. I made a ER 40 chuck a while back for my lathe and it holds .0002" TIR on my lathe, but when I move it to my dividing head or rotary table, I get .002 to .003" TIR. This is not acceptable, especially when cutting a gear. Soooo ... I decided to make a set true collet chuck that can be "zeroed" when moved to another machine or fixture. This is my version of the Set True ER 40 Collet chuck.
I started with a 4" diameter X 2 1/2" long piece of CRS 1018. This will make the collet chuck. A 5"diameter X 2 1/2" long piece of CRS 1018 will make the back plate.
I roughed the chuck to around .040" over on all dimensions. Once this is done, I will finish machining to size.
This is the chuck with all surfaces finished to size and polished. I will next thread the end for the nut and cut the 8 degree taper. All the machining is done in a single setup so everything is perfectly concentric. I will post the prints as soon as I get finished drawing them.
There will be more but I only get to work a little a few times a week right now. Many of you know I am facing a severe heath crisis right now, but I am trying to finish some projects before anything happens to interrupt my favorite activity.
I started with a 4" diameter X 2 1/2" long piece of CRS 1018. This will make the collet chuck. A 5"diameter X 2 1/2" long piece of CRS 1018 will make the back plate.
I roughed the chuck to around .040" over on all dimensions. Once this is done, I will finish machining to size.
This is the chuck with all surfaces finished to size and polished. I will next thread the end for the nut and cut the 8 degree taper. All the machining is done in a single setup so everything is perfectly concentric. I will post the prints as soon as I get finished drawing them.
There will be more but I only get to work a little a few times a week right now. Many of you know I am facing a severe heath crisis right now, but I am trying to finish some projects before anything happens to interrupt my favorite activity.