![]() ![]() I would also take Tubal Cains advice and drill at 70-75% (ish) engagement - you will not notice any difference in thread strength and it greatly lowers the risk of breakage. You probably won't need all sizes, so you could just purchase the ones required - HSS are best if affordable. They seem to have a 'deal' on BA taps at the moment. I've used Tap & Die Co (in the distant past) and I've no complaints about my threading tools, although I've not needed to purchase anything new recently. I assume you will need BA taps, which will restrict your choice of suppliers. ![]() Tracy tools all day long, Carbon steel more than enough for for a Stuart model. If further help needed, will try to oblige. Satisfied customer with no other connection. They claim to supply big names in engineering. They take a little longer but their taps appear to be first class. I have also used The Tap And Die Co of West London. I have used Tracy Tools who seem OK and they deliver fast. Being new to this, obtain a piece of cast iron to practice drilling and tapping so to gain proficiency and avoid breakage in the job. Failure to do so greatly increases the risk of breakage. Use some means of guaranteeing squareness of tap to the work. You can feel it happening especially on larger diameters. Half a turn or so forward with tap wrench then reverse to cut the swarf formed. A fellow model Engineer, ex - school metalwork teacher told me that he always uses the next larger tapping drill than recommended. ![]() Your subject has been done to death in the past but I will try to help, using my experience and knowledge. Good to see another new model Engineer haning a go. I have read about people breaking cheap Chinese taps in cast iron, I don’t want to add to this list. Can anyone please recommend good quality taps and dies as I am starting a Stuart No 9 and this will be my first time machining and working with cast iron. ![]()
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