G & M Code - How To Manually Program A Thread Mill - Vlog #57 

Hi Titan how can I use this technique for a single point thread mill?

Hello Titan, please explain about external thread milling 1/2"-14 NPT , X and Y starting position.

I was going to point that out lol

@@Lepp004 no there are many more lines needed for a single point thread mill. I was hoping this video was for a single point treadmill normally programming a single point takes me close to an hour without CAM. I was hoping he had a cool trick like the last 3D roughing video.

@@CNCVMCTECHNOLOGY it's the same principle only you're comping in not out, but if you're approaching a hub with clearance room personally I would use a lead in.

I do the same but with a 1." above part or fixture, clamp which ever is the tallest.

@@frankr608 excellent, I remember programming 1.0" or 2.0"...easy to check with gage, or 1x2x3 blocks. I have migrated to 5" or 10", as I am on large format horizontal boring mills now. This as you suggested, is safe to clear a number of obsticals. Programming manually or with cam packages, I feel there must be safety built in to the programs until fully proven.

Jag skulle vilja se verktygs- och borrnings och gänga sen conic tack

Circular milling small holes with an end mill and how you’d taper out without leaving any marks.

IX eleven thank you G13 is something I have to look into I use a Brother cnc and I believe it supports g13 and g14

How about programming a counterbore?

How about starting with the basics since you are teaching CNC. Every student should understand what all of the basic G&M codes do so they can read a program. Although you can get a list and read it, actually seeing it in a program and understand how it is used is a good thing. Tie the codes together and make a part that uses them so a new student can read, understand and see the codes in action line by line.

Awesome!

Awesome!

Do you always divide by 1in?

Thanks! Boom

Single point threadmilling is the shxt. So versatile and easy to use with subprograms.

@@ISILENTNINJAI Can you guys make one?I would watch it.

@@frankr608 the way I would use a treadmill is as follows. If doing 1/4-20 threads with a .250 thread depth on series of .350 deep drilled holes. 1÷20 threads =pitch or z movement while interpolating with G03. So .05 N1001 T1 M6(.125 DIA SINGL POINT THREADMILL) (Doing .250-20 threads) G0 G49 G90 X0. Y0. S2600 M3 (SPEED RPMS?) G43 H1 D1 z1. Z.1 /m8 (I use block delete to not get soaked by surprise when watching my distance to go) M97 P111 (CALLS SUB PROG) X1. Y-2. (DIFFERENT LOCATION) M97 P111 (CALLS SUB PROGRAM AND REPEATS) M99 P25 (SKIPS TO N25, PAST SUB PROG) (****SUB PROG BELOW****) N111 G91 G1 Z-.35 F15. (at .25 depth on part) G01 G41 X.065 [(.25 MAJOR DIA - THREADMILL DIA) ÷2] (START OF G03 MOVE) G03 X0. I-.0625 Z.05 L6 F25. (.05 *6 = .3 SO I KNOW THREAD WILL FINISH .05 ABOVE PART.) G40 G1 X-.0625( BACK ON CENTER) G90 G0Z.1 M99 (***SUB PROG END***) G0 Z1. M9 G53 Z0. M5 G53 Y0. X.? M30 I'm sure I can re arrange the subprogram portion to be after the m30 so that I dont need the m99 p25. But I just do it anyways as an extra precaution.

@@frankr608 wish I had a machine at home so I could shoot a video on it. Maybe titan will see this comment and do a tutorial on it?

@@ISILENTNINJAI thanks for that example. I was able to use that for a M12x1.5 thread. Thanks

When the D value is zero it wouldn't matter, I wonder if the comp would move the cutter off the centerline and leave a line in the thread, I guess it depends on how the HAAS handles that back and forth movement between passes. I noticed he had some code covered up maybe it was the G40s and he cut them out to simplify things.

That is correct but for the purpose of training via RU-vid it will likely confuse people and add to the complexity of the program. For a Beginner program it is perfect.

Glad you enjoy them Jim

Just use round stock with center drill . Or just find center of index head. Then take half the diameter of tail stock . Now just tap to distance of half the diameter using a indicator. Then indicate tail stock straight. It's not to hard after doing this a few times you will get fast at doing it.

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

Thanks Rob

Since you have not had an answer I will give you a few reasons that may help. One is that when tapping blind holes you can get a fully formed thread nearly to the bottom of the hole. If you were rigid tapping you would normally start with a taper tap then use a bottoming tap which requires two tools so adds time to the operation since the tool has to be changed. Another reason is that using rigid tapping for blind holes it can be hard to get all the debris out and the tool can jam and then snap off. This is usually a major problem if it happens as the broken tool will be stuck in a hole and can be hard to remove, a thread milling tool is a smaller diameter than the drilled hole so is unlikely to snap and is also a lot easier to remove if it does. A third reason is that a thread milling tool can be used for different sizes of thread, This tool, for 18 threads per inch (0.555" pitch so why wasn't that used in the demo instead of 0.55" as it will produce a loose and badly formed thread that will pass the go/no go test) can be used for any thread diameter with this pitch, a standard tap can only be used for one size. If you had a single point tool it can be used for a range of TPI/pitches and diameters. This means that if you have a tool changer with limited spaces you can use a single threading tool for many different thread sizes where standard taps would take up many stations. Fourth reason, you can produce left and right hand threads with a single thread milling tool. The final reason I can think of at the moment is for large diameter threads. There are two problems with these, one is the torque required goes up to the point where it may move the workpiece or stall the spindle on some machines and the other is the cost of large standard taps is usually high compared to a thread mill. Hope this helps

Ya, not much out there on single point thread milling, could sure use some help or links.

I appreciate the support!

Can you explain for 1/2" 14Npt external thread depth is 10mm. By index tool

If you don't use .000 on the tool diameter offset, You get 369 Cutter comp alarms. I think the fact that the offset is .000 means you don't need to cancel the G41 since it's technically 0 He would have done well to include that bit regarding the actual offset he used and why.

Dave, you can use as little as a .0001 comp value when using the (hole dia. minus tool dia.) / 2 formula as long as you set your dia. to zero in the offset page. Hope this helps.

Hi Tim thanks for the reply. I didn’t know that was a thing you could do. I always thought you needed correct tool info in geometry page. What about not needing a g40?

I just barely saw this trying to figure out how to do thread milling.. The way titan explained it was as if you are programming without tool compensation.. that is why there is a tool compensation error.. take out the g41 and try the same code

Boom!

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

I as well. What he failed to mention is.... you have to set the tool offset @ .000 for this to work, at least on my older VF-1. These are great videos, but there still needs greater depth of explanation on the why's, how's and for's.

Thanks!

Thanks for watching!

Umbre001 G72 in turning is rough facing cycle. In this you define material size and finishing pass, doc, stock to keep and machine do the roughing for you

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

Prevents a burr from forming at the top and prevents the first thread from being mashed when installing a screw.

Lol thank you

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

perhaps a feed like F50. but if you don't put a feed there the machine will use the last feed that was input, in this case F20.

Set your Cutter offset to .000 and the rest of the numbers as calculated, then run the tool .200 above the hole and see if it works before dropping it in and crashing a $250 thread mill. He fails to mention the offset needs to be .000 to start

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

Yes, just add a L value with number of rotations

Thank you so much but I've never used a L value? I've been learning so much from your videos and made me such a better operator could you use an example?

Thread Mill anything harder than 303ss

Same as imperial but with metric numbers

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA

It would work for single point thread mill???

ru-vid.com/show-UCxtqufRr5ifESAjhdkE_ujA