Broaching

a quick easy way to get a keyway on inside diameters


materials needed:

a broach set
an arbor press

(both available at TechShop)

Step 1:

using the broach set, fit the correct insert into your ID ( this example uses a .375 diameter insert)

grab the broach that goes with the size key you want and get the shim ready.  (this example uses a 1/8 broach)

Step 2:

using the arbor press "push" the broach through the insert into your part.  this will leave only a slight key way in your part.

Step 3:

place the shim into the slot of your insert and run the broach through again.  this will give you the depth you need for your key way.

Step 4:

and there you go - a key way on the id of your part