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MAKING A SQUARE BROACH

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ieezitin:
Lads

My needs dictate a 3/16 square broach for a project my Personality dictates I am cheap I refuse to pay $70 for a broach It’s a case of making one or probably multiple while I have a set up.

I have been thinking out the machining steps and the two major ones I think are the angled relief behind the cutting edge and the taper angle from the pilot start down to the last cut edge, Having both a lathe and a mill I have choice on what machine to use as both will do the job yet both are equal in set up.

I am curious has anyone made broaches and how did they do it?

Anthony

wheeltapper:
Hi
Clickspring made one here.

hope this helps.
Roy.

ieezitin:
Yeah i have watched this excellent video...... if you notice he uses a Sherline lathe which is capable of rotating the headstock he set it 3 deg horizontally a nice feature to say the least, this angled cut would have to be done differently on a conventional set up.

Thanks for posting..

Anthony.

philf:
Hi Anthony,

How deep a 3/16" hole do you need?

I've made hex holes in steel by simply using a piece of an Allen key with a cutting edge made in the lathe with a carbide tool set about 5 degrees from perpendicular. No side relief at all. I've pressed the tool in with the bench vice. I drill the hole about 0.1 - 0.2mm bigger than the a/f size and a shallow guide hole the across corners size.  It tends to make the hole tight on the key but if you repeat the operation turning the key 1/6 turn at a time it works fine.

I made a clock key in brass recently using a tool simply made by milling a square on a piece of silver steel with a small relief angle and the cutting edge turned on the lathe.

The method I'd like to try is http://mikesworkshop.weebly.com/rotary-broaching.html

Phil.

ieezitin:
Phil..

Nice work..

Your thread has given me room for thought about making a rotary broach seams quite simple.

my depth will be around 9/16 on this project and its in an 3/8ths round stock at an angle of 30 deg but there is room to put a champher on in fact its a mini boring bar i am designing ..

Anthony.

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