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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
Jacob B.
2025-08-08 14:21:42
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
2025-08-05 10:41:11
Well built, runs true, and just does what it’s supposed to do: Recommended!
Gene Fudge
2025-07-21 10:06:44
Works good on my frejoth mill.... no runout with a 2in annular cutter.....
Jim
2025-07-20 18:13:03
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.
Engineer
2025-05-23 10:43:18
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.
Sarah
2025-05-13 12:56:33
Threads start down in the tool 1/4†further than any other r8, so I had to make a new bolt
Just be informed
2025-05-06 18:30:08
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.
Ardi
2025-04-16 14:48:20
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.
David F.
2025-01-13 15:47:21
No nesecitas tener un taladro magnetico
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