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Carrier Block and Barrel Plate Broaching


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#1 zebradog

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Posted 19 December 2019 - 12:06 AM

I did a search but didn’t have any luck on finding instructions or walkthrough for broaching these parts. I have the broach but I’ve never used one before, so I thought I’d ask about it.

I was told the instructions had a section on broaching but I don’t see it anywhere. I know I need to stack the plates all up together and pin them together, and then start.

Is there anyone who has advice, things to watch for, or tips and tricks? Any help is appreciated, thanks in advance.

#2 maccrazy2

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Posted 19 December 2019 - 01:52 AM

There are members with experience that should chime in.
I’m on my first builds. We modified the design with a keyway in the shaft and carrier instead of the hex hole.

#3 zebradog

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Posted 19 December 2019 - 02:42 AM

Yah, I’ve already got it drilled for the broach and bought one, so that would kind of be taking a step backwards. That being said, that is definitely is the easier method.

#4 gbull

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Posted 20 December 2019 - 01:57 AM

Is it a one piece broach? Straight slotting broaches use shims behind the broach to allow multiple light passes. A form broach doesn’t have that option. The amount coming out of the corners isn’t really that much tho is it. It probably has a round end to guide it down the hole you drilled or bored in the center of your block. I’ve never used a hex broach but have done a lot of straight keyways on gears and pulleys. My best advice is to practice before you commit to a finished part. You should have an arbor press or some sort of hydraulic press. Getting started perpendicular is paramount. Once they go off kilter it is really hard to fix. I went with the hex bushings. They do have some runout but I think that can be worked around with some shims. Haven’t gotten that far yet but that’s the plan. Good luck with the broaching, and whatever you do don’t try beating it thru.

#5 bruski

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Posted 20 December 2019 - 10:42 PM

I think that passing the hex broach through all 3 pieces might be to many chips and not enough clearance space for them in the broach. I broached my parts by running the broach through the carrier block first, then pinning the barrel plates to it and run the broach through all three pieces.

 

bruski


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#6 zebradog

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Posted 28 December 2019 - 12:00 AM

Thanks for the replies.

I was thinking I’d broach the Barrel plate first since it’s steel, then set that against the carrier block and pin it, and then do the carrier. Once those two pieces are done, I can pin the front barrel plate and finish that last.
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#7 gbull

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Posted 28 December 2019 - 09:00 AM

Keep it straight going thru the carrier block or you will end up with more runout than using a hex bushing.
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