- This topic has 8 replies, 6 voices, and was last updated 12 years, 10 months ago by
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Yeah Johnzcars is quite right when he says about using a type of lube when cutting threads, you can get a specific cutting compound which works wonders by allowing a cleaner cut and trapping the pieces of cut metal in the lubricant, it also prevents heat buildup. It would help to have a thread gauge (if your tap and die set did not come with one) to gauge threads so you can select the correct size tool when chasing threads, and one last note, get hold of an Engineers Square to set the tool up perfectly straight and when cutting do one full turn and 1/4 reverse turn then 1 full turn etc to break the material away that you are cutting. You have acquired a helpful tool and it will come in very useful!
You guys are awesome that makes 100% sense to me and now I’m extremely confident that I will use it the right way when confronted with the problem that a tap and die set is for. Thanks again guys.
Quoted From yarddog1950:
Great find yarddog! As they say, a picture (video in this case) worth a thousand words.
Quoted From yarddog1950:
The link about says it all in my opinion well done Yarddog. The only thing that I would add to the posts above is that I would use motor oil or automatic transmission fluid in place of WD-40 as a lubricant.
For taps the threading process is very dependent on the hole size. If you try to cut a thread approaching 100% of the crest height, it takes very very much more torque than a 50 or 75% thread engagement.
I like things strong so I opt for a hole size that gives me greater than 75%, but this means you really have to be careful about not breaking the tap.
A broken tap in the hole can slow down or even end a project.
Those professional machinists out there can help me, but I think the usual recommended hole size is for a 75% thread engagement, which is a bit sloppy for my liking.
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