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Reduce RPM's by 2/3 upon engagement of workpiece chamfer. After ½ way into chamfer increase RPM's to recommended speed maintaining same feed rate. If this does not improve condition or machine has no RPM control, re-chamfering part after broaching may be required.

All forms will have some degree of twist. Chip formation on end of broach tool causes a reduction in RPM's of the broach holder spindle, resulting in miss timing of RPM's. (workpiece to broach)

a. Open pre-drilled hole or pre-turn diameter smaller.
b. Increase feed rate to a minimum .004 to a maximum .015
c. Check spindle endplay. (replace bearings if necessary)

There are several possibilities:

a. Check collet pad's for proper size.
b. Check collet pressure.
c. Open pre-drilled or pre-turn diameter smaller.
d. Check chamfer size.
e. Use serrated collets if possible.
f. Trapped coolant when internal broaching.

The holder is on a 1 degree angle, designed to reduce broaching pressure, which causes the holder to wobble. (Do not alter 1 degree angle)

a. Turn undercut before broaching.
b. Rebore or flat bottom drill after internal broaching.

Broaching produces very minimal heat, therefore coolant is not a major requirement. Any water or oil based fluid is acceptable.

Note: When internal broaching, coolant could be trapped in front of tool causing inability to broach to full depth. If this occurs, turn off coolant or open pre-drilled hole larger to allow coolant to escape.

Fluids play a minor role in rotary broaching. Any type of water or oil based fluid is acceptable. The chip is a flowing type and the amount of heat generated is very minimal.

When internal rotary broaching in blind holes, fluids should be applied on the broaching tool tip prior to contacting workpiece and not inside of workpiece pilot hole. Trapped fluid sometimes is unable to escape causing inability to broach to full depth.

For external rotary broaching, fluids may be applied prior to or continuously on workpiece diameter.

Lubricate every 2 hours of continued usage. After lubrication, hand rotate spindle to relieve pressure caused by greasing. Slater Tools offers and recommends Mobiltemp SHC 32©. This is a clay thickened, synthetic, dark red grease. Do not use grease containing graphite. (Mobiltemp SHC 32 is available from Slater Tools)

Replacement parts for Slater's Rotary Broach Holders are available from stock. Orders placed before 3:00 p.m. EST will be shipped that same day. Later orders will be shipped the following day.

Upon receipt of your Slater Rotary Broach Holder, an evaluation and price quote will be submitted for your consideration before repairs are made. Once we receive your authorization to proceed, your holder will be repaired and shipped back to you within 48 hours.

Broach sharpening is available by Slater Tool. Delivery is available within 48 hours.

The broach must have a one and one half degree clearance angle and a five to fifteen degree positive rake angle. To produce a clean surface, it is necessary under certain circumstances to dull the cutting edge slightly by means of an oil stone, fine emery or similar material.

Serration Broaches

Spline Broaches

Spur Gear & Involute Broaches

Stock orders placed by 3:00 p.m. will be shipped that same day. Later orders will be shipped the following business day.

Orders subject to credit approval and company policy.

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Please call Slater Tools to open a new account. Credit terms are net 30 days. For your convenience, orders can be prepaid or shipped COD. Slater Tools also accepts payments using Mastercard, Visa, and American Express. Wire transfer is available for foreign accounts.