12-05-2016, 08:25 AM
(12-05-2016, 02:37 AM)Seanlogie Wrote:(12-04-2016, 03:08 AM)Vinny Wrote: What don't you understand about the gearbox?
Whre to postion each lever for a certain thread...
As Pete said, you simply match the position of the two levers in your picture to the corresponding position on the chart. For example, to cut a 13 tpi thread, position the top lever to position B and line up the bottom lever with the column on the chart that reads "13" (second from the right). It is that straight forward.
When cutting a thread, I like to take a scratch pass. I'll apply some ink to the part that I am threading (using a sharpie) and set the tool so it only just scratches the surface. Then I make a single pass and make sure that the scratch lines up with the corresponding thread on my thread gauge.
This is more important when using change gears but I'd do it just the same to make sure I don't wreck a part by making a silly mistake.
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