Boring Delrin Bushing

Guys tomorrow going to give it a try using an end mill.For some reason I have couple that came in a box yrs ago at estate sale
 
Guys,I tried to find something that I could bore the bushing but have nothing that is long enough to bore 2".So I tried my Shars boring bar which the insert is kinda rolled down some so guessing this makes the tip of the insert more of a negative than being at 0.I am trying an insert that is for fine finish for steel but its just not doing the job.Seems like its just riding on the surface instead of cutting.I just don't have anything that will work so that leaves me with shopping.Which I really didn't want to spend more money but if I destroy this bushing then there goes 76.00 plus alot of time.Guys would it be possible for someone to point me toward correct boring bar or what is needed to bore out say 2"-2.5" dept and get a smooth finish?This pulley has to slide up/down on shaft which is for a BP.Oh guys is it normal for boring bars such as this one from Shars to have the insert rolled downward?The bar itself has 4 flat areas that fits in the tool holderIMG_0523.jpg
 
You can also use the edge of a sharp drill bit as a boring bar- I've done it several times in a pinch. You need to set the cutting edge a bit above center for it to cut well. I wouldn't try it for steel, but for cutting aluminum and plastics it works fine. Takes a little experimenting and adjusting but it works. Try about a 5/16" or 3/8" size drill; place it at an angle approximately like the picture above, take light cuts
mark
 
Yahooooo! It work,Plan C did the trick using the file.I don't know if this is what ya'll talking about but it work.The blue pieces I just set up there for pictures.Guys it also fits the shaft,guys if ya'll will if this is not what talking about please explain how I should do for the next time.
IMG_0524.jpgIMG_0525.jpg
 
Mark I did look to see if I had any drill bits that were long enough but that ideal come up short.But next time I come across some long drill bits at garage sale I will not pass them up.
 
Kroll said:
Guys,I tried to find something that I could bore the bushing but have nothing that is long enough to bore 2".So I tried my Shars boring bar which the insert is kinda rolled down some so guessing this makes the tip of the insert more of a negative than being at 0.I am trying an insert that is for fine finish for steel but its just not doing the job.Seems like its just riding on the surface instead of cutting.I just don't have anything that will work so that leaves me with shopping.Which I really didn't want to spend more money but if I destroy this bushing then there goes 76.00 plus alot of time.Guys would it be possible for someone to point me toward correct boring bar or what is needed to bore out say 2"-2.5" dept and get a smooth finish?This pulley has to slide up/down on shaft which is for a BP.Oh guys is it normal for boring bars such as this one from Shars to have the insert rolled downward?The bar itself has 4 flat areas that fits in the tool holderView attachment 277493
Click to expand...
With a thicker carbide insert yes it's normal for the insert to be rolled down like that. It provides the additional bottom clearance for the bore.
 
Kroll said:
Guys,I tried to find something that I could bore the bushing but have nothing that is long enough to bore 2".So I tried my Shars boring bar which the insert is kinda rolled down some so guessing this makes the tip of the insert more of a negative than being at 0.I am trying an insert that is for fine finish for steel but its just not doing the job.Seems like its just riding on the surface instead of cutting.I just don't have anything that will work so that leaves me with shopping.Which I really didn't want to spend more money but if I destroy this bushing then there goes 76.00 plus alot of time.Guys would it be possible for someone to point me toward correct boring bar or what is needed to bore out say 2"-2.5" dept and get a smooth finish?This pulley has to slide up/down on shaft which is for a BP.Oh guys is it normal for boring bars such as this one from Shars to have the insert rolled downward?The bar itself has 4 flat areas that fits in the tool holderView attachment 277493
Click to expand...

Good grief, is that what they are charging for those bushings !
I would have bought some thick wall Delrin tube and machined it to suit. I know plastics have taken a jump in price, but for that money you could have 10 feet of tube. Plenty to make mistakes with.

Anyway, congratulations on a job well done !:eagerness:
 
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