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| MadNick:
Afternoon, I ran into a problem! The base of these needs to take a 1/2" UNC thread running at 1/2" deep - I have drilled it out ok with a new 27/64 drill, taking it very slowly and using lots of coolant but the tap is getting so tight that after a couple of turns I had to back off before something breaks. Any ideas what could be wrong please? I suppose now would be a good time to ask what kind of taps I should be using ... ;) @DaveH the raw material is stainless - I really wanted to use mild steel but have nothing of the right kind of diameter. Might have to buy some now! @Brass machine. Its an Ironhead Sportster lump in a custom hardtail frame. Ill put some pics up once I get a bit further. Nick |
| Fergus OMore:
Nick, Two issues! One is what tap were you using and the second is what drill did you use? Of course, you might have work hardened the stainless steel. A lot of possibilities but really you should have screwcut first and then followed up with the 'first' cut tap. Mebbe, a dremel type of grinder might slightly open the hole and the dremel might sharpen the tap. I'd use lard oil for tapping- but I'm funny that way. I'm also funny peculiar because Lidl has these Dremel type beasties for sale------TODAY Kung Hay Fat Chow Norman |
| sparky961:
I've never had the opportunity to hand-tap anything much larger than 1/4-20 in stainless. I have, however, tapped many a through hole that size under power on a bridgeport clone. The way it was done was to use plenty of "Tap Magic" on a small brush, keeping the tap dripping with it as it went in. Lots of torque and very slow. Smoke is good - if it stops smoking, you're screwed. As was mentioned, with stainless you have to be concerned with work hardening. Basically you need to get in there and do your cuts with conviction and get out. The 1/2" deep part also made me wonder - are you trying to start the hole with a bottoming tap? A taper tap probably wouldn't start, and a plug tap might be a bit tight. Just thinking out loud on this one... -Sparky |
| DaveH:
Nick, You need to start the taping with a "tapper tap" use some cutting fluid, again take it slow and steady. :) I am assuming you are familiar with the accepted way of hand taping. :beer: DaveH |
| MadNick:
Thanks fellas, Quick responses too - are we all working from home today?! I dont think my taps are adequate this time and I used my lard in the pastry I made the other day ;) Time to reconsider my approach... Nick |
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