Rotary Broach Tool Holder, 2MT 3772 (Discontinued)

Creates square and hexagonal, blind or through holes
Broach depth to 1.5 times broach width

Part Number: 3772 (Discontinued)
Weight: 0.91 lb

Price: $79.95

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The rotary broach creates square and hexagonal, blind or through holes. It can be used in a milling machine or a lathe.

The broaching depth can be up to 1.5 times the dimension across the flats of the shape you want to broach. For example, you can broach a ¼" square hole up to 0.375" deep.

The material to be broached should not be harder than 200 Brinell. This means you can broach aluminum, brass, bronze, soft cast iron, and mild steel. In general, you are safe with any steel where the last two digits of the AISI number are less than 30.

The rotary broach tool holder is a lot like a live center. There is a bearing between the tool and the shank. But the tool is mounted at a 1 degree angle to the shank. So as the shank rotates, it "wobbles" the cutting tool. This 1 degree wobble advances each of the facet cutting edges in turn as the broach advances into the hole. The material that is removed curls into the bottom of the hole.

Chris' Tips

Chris' Tips
Rotary broaching is a fast and accurate method of producing internal polygon forms.

Here's a photo of a hex hole made with the rotary broach.

Compatibility

Compatibility

This product works with lathes with a 2 Morse taper tailstock taper and a short 2 Morse taper tailstock taper including:

Enco 110-0803 Enco 7x10 Mini Lathe
Harbor Freight 33684 Central Machinery 7x10 Mini Lathe
Harbor Freight 93212 Central Machinery 7x10 Mini Lathe
MSC 0192857 Enco 7x10 Mini Lathe
Bolton CQ9318 7x12 Mini Lathe
Busy Bee Tools CX704 Craftex 7x12 Mini Lathe
Cummins (Tools Now) 5278 7x12 Mini Lathe
Eastwood 32497 7x12 Mini Lathe
Grizzly G8688 7x12 Mini Metal Lathe
Harbor Freight 93799 Central Machinery 7x12 Mini Lathe
Homier 03911 Speedway 7x12 Mini Bench Metal Lathe
LittleMachineShop.com 1012 LittleMachineShop.com 7x12 Mini Lathe
LittleMachineShop.com 1014 LittleMachineShop.com 7x14 Mini Lathe
Northern Tool 49656 KLUTCH 7x12 Mini Lathe
Princess Auto 8507659 Powerfist 7x12 Mini Lathe
SIEG C2 7x12 Mini Lathe
Tormach 30689 7x12 Duality Lathe
Travers Tools OT222300 OTMT 7x12 Mini Lathe
Warco 3004 7x12 Mini Lathe (Metric)
Warco 3005 7x12 Mini Lathe (Imperial)
WEN 3455 WEN 7x12 Mini Lathe
Micro-Mark 82500 MicroLux 7x12 Mini Lathe
LittleMachineShop.com 4200 HiTorque 7x12 Deluxe Mini Lathe
LittleMachineShop.com 4100 HiTorque 7x12 Mini Lathe
SIEG SC2 7x12 Mini Lathe
Micro-Mark 82710 MicroLux 7x14 Mini Lathe
LittleMachineShop.com 4959 SIEG 7x14 Mini Lathe
SIEG C3 7x14 Mini Lathe
Big Dog BD-0618Ax300 7x14 Mini Lathe
Big Dog BD-0618x300 7x14 Mini Lathe
Warco 4820-350 7x14 Mini Lathe (Metric)
Warco 4800-350 7x14 Mini Lathe (Imperial)
Grizzly G0765 7x14 Mini Lathe
Micro-Mark 84631 MicroLux 7x16 Mini Lathe
LittleMachineShop.com 7450 HiTorque 7x16 Mini Lathe
LittleMachineShop.com 5100 HiTorque 7x16 Mini Lathe
LittleMachineShop.com 7350 HiTorque 7x16 Mini Lathe
LittleMachineShop.com 5200 HiTorque 7x16 Mini Lathe
Prazi SD400 7x16 Lathe
MX-8x14 Preenex (and others) 8x14 Lathe
Harbor Freight 44859 Central Machinery 8x12 Precision Mini Lathe
Grizzly G0768 8x16 Benchtop Lathe
Emco Compact 8 8x17 Lathe
LittleMachineShop.com 3536 HiTorque 8.5x16 Bench Lathe
SIEG C4 8.5x16 Bench Lathe
SIEG SC4 8.5x16 Bench Lathe
Travers Tools OT218410 OTMT 8x16 Bench Lathe
LittleMachineShop.com 3595 HiTorque 8.5x20 Deluxe Bench Lathe
LittleMachineShop.com 3540 HiTorque 8.5x20 Bench Lathe
LittleMachineShop.com 7500 HiTorque 8.5x20 Bench Lathe
LittleMachineShop.com 7550 HiTorque 8.5x20 Deluxe Bench Lathe
BD-920N Jet 9x20 Lathe
Grizzly G4000 9x19 Bench Lathe
Harbor Freight 45861 Central Machinery 9x20 Bench Lathe
SIEG C6 10x21 Lathe
Busy Bee Tools CX705 Craftex 10x21 Lathe Mill Combo
Grizzly G0516 10x21 Lathe Mill Combo
Prazi SD500 10x20 Lathe
SIEG M6 10x21 Lathe Mill Combo
SIEG C8 11x24 Lathe

This product works with mills with a 2 Morse taper spindle taper and a 3 Morse taper spindle taper including:

Prazi BF400 Mill
Prazi BF450 Mill
Clarke CMD10 Metalworker Micro Mill
Harbor Freight 47158 Central Machinery Micro Mill
SIEG X1 Micro Mill
SIEG SX1 Micro Mill
LittleMachineShop.com 4700 HiTorque Micro Mill
SIEG SX1P Micro Mill
Bolton XJ-9510 Mill/Drill
Clarke CMD300 Milling Drilling Machine
Grizzly G8689 Mini Milling Machine
Hare & Forbes HM-10 Mill/Drill
Princess Auto 8507667 Powerfist Mini Mill
SIEG X2-MT3 Mini Mill
Micro-Mark 82573 MicroLux Milling Machine
Harbor Freight 42976 Central Machinery Mill/Drill
Grizzly G0516 Lathe Mill Combo
SIEG M6 Multi-purpose Machine