Custom tap and die price shock

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skiprat

skiprat

Passed Away Mar 22, 2022
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I was hoping to have a tool gloat soon. I asked a UK cutting tool manufacturer ( that specializes in taps and dies ) to give me a price for a 0.391'' x 36 tpi tap and matching die, both 3 start.
I told them I needed them to be able to handle stainless steel.
( I want to make screw capped kits )

Easy peasy, they said.....

$182 for the tap and $320 for the die. Ouch!!!:(

I have now opted for plan B. The company that I bought my metal lathe from does training courses on doing tricky threads like this for much less and I should be able to do any size. I think this will be my Christmas present to myself:)
 
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Originally posted by Rifleman1776
<br />"Easy peasy"???

Can you put that on a public forum? [;)]
Click to expand...

Does this common UK phrase have a different meaning in the USA?
Here it just means 'easy as pie' or 'piece of cake'[?]
 
Originally posted by LostintheWoods
<br />Ignore him, Steven, he's just yanking your chain. Maybe if you can get him to stand up from behind the monitor, someone will recognize him and take him back to his ward.
Click to expand...

Yes, Steven, it was a joke. The phrase has no real meaning here. I was having fun with you.
Sadly, Lost is revealing that he is one of the blessed ones here. Able to make insulting comments about others and get away with it. Sad. See my signature.
 
C'mon, Frank, I was joking with you, just as you were with Steven. I see you and Ed cavorting on here quite frequently, and just didn't realize that I was treading on restricted ground. If I offended you, it certainly was not my intent, and I am sincerely sorry.
 
You guys make it so hard to read these threads sometimes! [:D] Sometimes I get to the end laughing but can't remember what the real point of the thread was.[:)] Tap/Die...Easy Peasey...Oh Yes! Take the class and enjoy then write a how-to for everyone else.
 
Originally posted by Mikey
<br />You mean you had a metal lathe and you asked someone else to do that for you? For shame.
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Hi Mike, afraid so[:I] but in my defense, I have done some normal threads on my machine.[:)] The 3 start threads are a bit tricky though and I'm not sure if my machine can do them. It is not a CNC.
I particularly wanted the 3 starts because I have found that the single fine thread can lock if the cap is put on a little tightly.

Has anyone done these threads on a manual non CNC lathe? I think I could figure out how to advance 120 deg for the second and third cuts, but choosing the gearing to get the tpi correct beats me. [xx(]( for now, anyway)
 
Originally posted by LostintheWoods
<br />C'mon, Frank, I was joking with you, just as you were with Steven. I see you and Ed cavorting on here quite frequently, and just didn't realize that I was treading on restricted ground. If I offended you, it certainly was not my intent, and I am sincerely sorry.
Click to expand...

Accepted.
 
The threads per inch would simply be 1/3 of normal, or 12 tpi in your case. You can make 1 thread like normal, then adjust your tool for the next thread and use the same numbers on your thread dial. You might need trig or CAD to figure out exactly how much to move the compound slide (at 29.5 degrees) back while also feeding your cross slide in to get back to the proper zero point. It will be exactly 1/36" in the longitudinal direction that you'll want to end up moving it. Once it's in the proper position, just make another normal thread. Do the same thing for the third thread.
 
Thanks for replying Bruce. If I understand you correctly, does this mean that once I have figured out how to get the gearing to give me 12tpi, I then simply only have to move the tool 1/36 to the right after each cut? (assuming I cut from right to left)This will then have the effect of delaying the next cut till the workpiece has rotated 120deg?

What would you advise on the cuts, finish each cut to the correct depth first or do each light pass on each thread?
I am hoping to get decent replacable tip tools soon. At the moment I just use the budget carbide bits. When I get the new bits do you think they will be good enough to do each thread in one pass? The threads seem pretty shallow so I'm hoping this will be the case.
Thanks again[:D]
 
Yes, that's correct Skiprat. It gets a bit tricky in that you normally don't set the compound rest to be aligned with the axis of the lathe, but at an angle to it, so the 1/36" will not be as simple as dialing in .028" on the dial. I would probably do each thread in several passes before moving on to the next thread.
 
Thanks Bruce[:)]

Have to watch the telly now. World Cup Rugby Final.

South Africa v England. Not sure who I should be cheering for.[:eek:)]
One has my heart, but the other has my soul
 
Originally posted by skiprat
<br />
Originally posted by Rifleman1776
<br />"Easy peasy"???

Can you put that on a public forum? [;)]
Click to expand...

Does this common UK phrase have a different meaning in the USA?
Here it just means 'easy as pie' or 'piece of cake'[?]
Click to expand...

Bye the bye, Steven. I knew what you were saying. I lived almost three years in the U.K. In fact, I was pullin' the mick outa ye.
As for the rugby. I used to photograph rugby and know all about it. First they sorta huddle, then they scrim and scrum. Someone kicks the ball around, another tosses it sideways. Soon everyone is so muddy ye can't tell who is on which team. Then they all go for sausages and beer.
Oh, another rule. Never digress from the subject of the thread. [;)]
Cheers, Mate.
 
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