![]() My goal when making them was to be on the lower limit of the Iso Norm, 0.02mm oversized. So I felt that I will have a lot of play when making the broach too big. Measured my allen keys and they are all or spot on or below the mentioned key number. I have made my broaches before reading your comments, lets see what you think of them, I am open for any comment! If we call the grinded end of broach the tip length, do you mean that the tip length should be at least the corner to corner distance of the broach? In other words, don't make the tip length too short? Ken, I am sorry but I do not understand what you mean. What would be the correct tolerance on broach cutting sides?įor example a 6mm hex broach, should it be spot on 6.00mm or make it slightly oversize like 6.01mm? Tomorrow I will make some different size of broaches. Now its tempered.ĥ) Clean up again the shaft with sanding paper and I honed the front side of the tip and the 6 cutting edges slightly with a fine honing stone. Be careful to not damage the sides, just make them clean.Ĥ) Heated from the back of broach and watch the straw color go up until the tip (this is not so easy to see) and again put it in cold water and keep moving until it cooled down. Put it in cold water and keep moving until it cooled downģ) Clean up the shaft with sanding paper and the tip or with sanding paper over a file or a honing stone. If you look closely to the aluminum bar you will see that the hole was oversized, the broach cutted at the darker parts at the side inside the hole.ġ) mill the hex to size at 1.25 degrees angleĢ) Wrap a piece of wire around the broach and heat it until carrot orange. Not a single sign of use on the broach and it went in like cutting butter (could rotate the tailstock with one hand easily), thanks for the help! It seems to work, made 2 hex holes, one in aluminum and one in brass. ![]() We are getting somewhere! Remade the broach yesterday and followed the advice given in hardening.
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