Make a Home Made Tap

Today we're making a homemade sack and first stage is just machining the drill rod down to size and I've got that on pretty high speed because it's pretty basic at this stage we're just turning  the end down to the thread diameter that  we need and then machining some  clearance on the shank and we've got it  bang-on dead nuts.

The next stage is to  put it in the milling machine and square  up the end using square collar block to hold the work and I just flip that over  to get each side once once we've got the  depth down what we need and looking back  at the video I could see that the end  Mel's a bit blood for this this so I'm  taking a bit deeper cut and you can see  it's a bit blue there but never mind you  got there in the end anyway now is the meat and potatoes of the operation.

We're  going to cut a multi start thread in the  in the lathe and it's a metric thread on  an imperial lathe so first thing we've  got to do is set up the tool make sure  it's square and then slow things down so  we can control everything by putting the  back ears on  and that's looking good .

So the first thing to do is to set  everything up and then take a small  scratch cut to make sure everything's  lined up properly and we've got our  depth set properly and everything looks  as it should do and we're looking pretty  good at this point  so then it's better of backing off the  cross slide and reversing the lathe you  never release the half nuts when you do a metric thread.

Because you can't use the indexing dial so then it's just a matter of what for lots of cuts to  build up that first thread and I first  sped that up as much as likely possibly  those so you can get the idea I was cutting a quarter of a millimeter at a  time to get it down to depth thereby  when it looked good I took note of the  final depth and then it's a matter of  offsetting the compound slide by one  millimeter and then basically.

Repeating  the process and do that one more time  again to get the third thread to create  the triple start thread and the reason  it's a triple start thread is because  this tap is going to be used to make a  pen and pens typically use a very steep  thread and they use triple triple start  so that they can have a combination of a  steep thread so the lead can can be  removed and replaced quickly with a  single turns and without being too  coarse so it still looks like a very fine thread but it's easy to remove the  lead in one twist and of course that  kind of tap is very difficult to  purchase.

You can get them specialty  order but they're very expensive so why  not make one this is the way to do it so  now I'm just fast-forwarding through the  rest of the threads and getting a pretty  good cut there you can see  it looks a bit hairy but that cleans up  later with a fire and what I found is a  tool with a positive rake is best for  for form cutting tools so this the tool...

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