So i have done thread milling in the past, but never bought one and programmed it.
I was thinking that a Single Point Thread Mill would be the best route because I can use on multiple Threads.
Is there a certain degree cutter for different threads?
Internal Threads drill to minor dia then Thread Mill to Major dia?
External Threads cut to major and Thread Mill to Minor dia?
Just need a little push in the right direction or some where with more information than I have found. I don’t want to just have the answer I want to understand it. Which I think i have the concept down just need a little nudge.
I have a M30 x 1.5 Thread thats needing to be done and was going to practice on some scrap.
Also we have some Pipe thread that will need to be tapped. I really never know what might be coming hence why I said the Single Point Thread Mill would be a better buy in the long run. I know the inserted style will be faster but no time constraints here.
1 Like
If you are using a single thread milling cutter or whirler, the OD of whirler must be smaller than ID of your internal thread. For internal threading of a RH thread, I would call up tool to hole centerline position, move in Z to depth of thread, move in X to major diam. (-. a few thou) then helix out. This way you do not pack any chips to bottom of hole. I ran a good many 0-80 and M2-.4 about .190" deep all day long in Titanium. Running a whirler about 30,000 rpm. Great tool life and repeatability.
3 Likes
Stephen thanks for that information, now the digging starts as i try and find that one Single-Point Thread Mill that will do a good size range of threads.
1 Like
Here are some tools that I have used for single point thread Milling. The standard boring bar works fine whith it’s ability to change inserts. In 2.5" diameter shop made one works really good also. But the one that I have used the most is the old shop made one and a quarter inch diameter with 1 inch shank that I turned down. this one has six inch of reach as a minimum but it does work good with that length.
1 Like
Also on those Oddball threads I generally make a gauge if I cannot easily obtained a bolt this one is a 1 7/8 - 12. A word of caution if you make a gauge or use a bolt you need to allow clearance don’t just cut it to where the bolt fits there’s a specific amount of clearance and most larger-diameter bolts .I will check your ready reference for that data. I also often purchase the larger Taps on eBay rough cut them in with the treadmill and I finish them up with the tap.
1 Like
Internal threads use a laydown thread bar if you can the cost is way less and quicker in most cases.
If you are doing these in the mill and time is a concern and you can spare a little extra money a full profile thread mill works well. Much faster than a single point thread mill as well.
Od threading again use a laydown threading insert.
If you are going to do a lot of threading you can get pitch mics off ebay, which is way better than using wires imo.
1 Like
I use th 12-32 single point from Lakeshor Carbide. Been good to me so far.
2 Likes
Thanks for all the great information I have found quite a few single points. I’m going to narrow it down to about 2 or 3 so we have a range if ever needed for future projects. I know that there are a few coming up plus I’m going to practice doing a few different threads and thread types. Just to increase my knowledge never stop learning always push forward.
1 Like
