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Accusize Industrial Tools Annular Cutter Arbor, R8 to 3/4" Weldon Shank with Coolant System for Drill-Use Annular Cutter on Bridgeport Milling Machine
- R8 to 3/4" with coolant system
- With a key
- For drill-use annular cutters on Bridgeport Milling Machine
- Fit with Any Size Annular Cutters which Have 3/4'' Weldon Shanks
R8-3/4" Weldon Shank
- For annular cutters with 3/4" Weldon shank
- Loaded with a spring for pilot pins
R8 Shank Threading: 7/16"-20
- R8 shank to 3/4" Weldon shank
- For the bridge port - 7/16"-20
Coolant Through System
R8 to 3/4" with coolant system
Product dimensions (dimensions in millimeters and inch):
Schema Diagram
Engineer
Reviewed in the United States on January 1, 2025
I wanted to like this arbor. All OD journals are ground and it looks beautiful. I have checked all important dimensions and most were reasonably OK. Even the 3/4" tool bore was right on size, it measured .7502". However the bore runout was .0035" measured in my pretty good spindle. The R8 taper angle was also on a small side and the taper did not make a good contact with the spindle. This could contribute to the runout as well.As several people already mentioned the 7/16-20 thread has an unusually deep counterbore. It does not need to be .350" deep like on mine. .100-.150" is plenty deep, deeper counterbore may cause problems in some machines.I just got several new R8 collets and all of them do not exceed .0005" runout in the same spindle. I do not see why this arbor cannot be made at least as good as regular collets. It is unusable and going back to the seller.
Just be informed
Reviewed in the United States on September 1, 2024
You really need this if your drilling holes using anular cutters in a milling machine. I've cut hundreds of holes in a mill just chucking the bits in a 3/4 collet. This is a much better solution by far.
Gene Fudge
Reviewed in the United States on July 15, 2024
Works good on my frejoth mill.... no runout with a 2in annular cutter.....
Jim
Reviewed in the United States on February 23, 2024
I have a collection of annular cutters from when I had access to a former shop mate’s magnetic drill. My new shop mates have a JET milling drilling machine with an R-8 collet that they let me use, so I started looking for an R-8 collet to 3/4” weldon shank adapter. There are a few available, but this one seemed to be the only that had (or at least specified) a built-in spring for the pilot. And… it works great!The only issue — and not much of one — is that the spring-loaded part of the collet takes up some room within the collet, so when I tighten the draw bar to hold the collet/adapter, the draw bar bottoms out within it before the collet is seated. That’s easily remedied (temporarily at least) with a 1/2” +/- stack of 3/8” (I think) washers at the top of the draw bar. Long term, I’ll probably order a shorter draw bar, or if not available, I’ll get another of the same and cut a half inch off of it.This thing should work great for anyone who wants to use 3/4” weldon shank annular cutters on a milling and/or drilling machine that uses an R-8 collet.
Jacob B.
Reviewed in the United States on November 6, 2024
Works well, very functional, and simple. fit my r8 bridgeport just fine. I opted for a non coolant model as I have a coolant pump on my machine already and don't have to gravity feed coolant threw the cutter.
Jeff Mc
Reviewed in the United States on October 19, 2024
Well built, runs true, and just does what it’s supposed to do: Recommended!
Sarah
Reviewed in the United States on March 23, 2022
Threads start down in the tool 1/4” further than any other r8, so I had to make a new bolt
David F.
Reviewed in Mexico on August 31, 2020
No nesecitas tener un taladro magnetico
Ardi
Reviewed in the United States on May 6, 2020
I use it on my Jet Mill JDM-18. It fit perfectly in the Mill.Now I can use my Evolution Annular Cutter (round drill bits) on the Mill, which Mill does a perfect and easy job versus the Magnetic drill that I was using before having the Mill.FYI. (My worry was that, previously I bought an R8 Collet set and some of the Collets did not fit this Mill and were useless). But this Adaptor fits perfectly.
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