Oil Groove Bushings

[FireMedic]

I’ve always had JGS slot my bushing screws for my oil flush system. I know they offer the oil groove bushings also. They are thicker then standard bushings and have grooves cut on the outside.

I was hoping someone with experience with both would give me their opinions on which one they prefer and why.

I was thinking about switching, but haven’t done it yet because I have a pretty good collection of standard bushings.

Thanks

 

[Walt Krafft]

I get much more flow from the oil groove bushings. I am probably in the minority, I like the C clips more than the screws. I notched an old screw driver that pushes on the ends of the clips and pops them right off.

 

[Alex Wheeler]

I have no grooved bushings. Most of the time I dont use a bushing so it doesnt matter but the reamer has more to do with it than the bushing. I have reamers that cut on all flutes, they flush well. I have others that cut on one or two and get clogged. It would take a huge amount of pressure to flush those reamers. They just need to be handled differently and the finished product will be good.

 

[FireMedic]

I have no grooved bushings. Most of the time I dont use a bushing so it doesnt matter but the reamer has more to do with it than the bushing. I have reamers that cut on all flutes, they flush well. I have others that cut on one or two and get clogged. It would take a huge amount of pressure to flush those reamers. They just need to be handled differently and the finished product will be good.

No bushing would simplify things. I’ve never not used a bushing. I’m guessing you are rigid reaming, or relying on the prebore to center the reamer and not the bushing.

I guess it’s time for me to try some new things and see what happens.

 

[ridgeway]

I grooved mine with a Dremel for a little more flow. I run the reamer in so far and pull out to let chips flush. The main reason I like to run a bushing is for end of reamer rigidity. True that a reamer will follow the bored true hole. It's when the reamer is deep and fully engaged...just don't want a wollowed out neck and leade. I run a JGS floating holder. My chambers come out tight and no run out. Some may show just a flicker on interapid, but that is meaningless. Alex said the end result is key...

On a side note...I had a reamer gain so much magnetism that I could pick up a go gauge with it! I had a heck of time keeping chips off it. Demagnetizer works great...

 

[LVLAaron]

No bushing would simplify things. I’ve never not used a bushing. I’m guessing you are rigid reaming, or relying on the prebore to center the reamer and not the bushing.

I guess it’s time for me to try some new things and see what happens.

For what it's worth... I recently did two chambers with no bushings. I use a JGS floating holder, predrill and bore the chamber after dialing in the throat area. The barrels were bartlein 308's that had 299 minor diameter... and I just didn't have bushings that small.

The reamer I used was excellent and cut very evenly on all flutes, and the end result was less than 1.5 tenths of runout. I'm starting to believe that if your setup is good, lathe is flat and tailstock is aligned you don't need a bushing.

This was with a carbide reamer so I had to keep the feed pressure up... which I'm sure helps keep things centered.