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When you are rigid tapping you must have the tap held rigidly in a collet holder or something like that. I just use regular ER32 holders and have tapped up to 3/4"-16 okay. I tried 3/8" NPT and stalled the spindle but the collet did not slip.
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Do any of you use any special tap holders such as the Tapmatic Synchroflex on the Haas machines? Or are they just completely unneccessary? I'll have rigid tapping but from what I read one of the tension only or at least radial float attachments are a good idea.
When you are rigid tapping you must have the tap held rigidly in a collet holder or something like that. I just use regular ER32 holders and have tapped up to 3/4"-16 okay. I tried 3/8" NPT and stalled the spindle but the collet did not slip.
An open mind is a virtue...so long as all the common sense has not leaked out.
Any tips for rigid tapping?Originally Posted by Geof
On many modern CNC machining centres the rotation of the spindle can be synchronized with the feed axis. This allows to produce threads with tool holders without length compensation. However, practical experience shows that even with this kind of "rigid tapping", synchronization errors can occur.
I alway use to EMUGE collet holders type KSN/Softsynchro when I had problem with tap breakage on spindle change of direction.
As they serve as absorbing link between synchronous spindle and tap/cold-forming tap, and compensate pitch differences between threading tool and synchronous spindle, resp. drive.
Alan
More... http://www.mctooling.com/category/36...ndCollets.html
Hello,
we have a good experience with Syncro sistem, the tool life increase, the tool brokes decrease, also with roller taps, the set Syncro and tool, working very well, better that conventional sistem. The sistem used was GEWEFA SOFT SYNCRO, with low cost and good performance.
Travis, both Astonlee is righ and Geof are right. it boils down to howmuch you want to spend and the work load. If you have a job that requires an incredible amount of tapped holes and you are going to be doing it quite often, the spend the extra money and get one of the may syncro holders out there. If you will be doing tapping once in a while, then as Geof suggested, a normal collet ER32 or whatever you have will do just fine.
Just write the program.
Oh, and drill the tapping hole first.
Perhaps you want me to be serious?
The most important thing is make sure the tap is running true, this can be very important with small taps which can easily break; with large taps runout will give an oversize thread.
I think that is about it. I always set R in the G84 line at about the tap diameter to give a small distance for the machine to get synchronized but really I think this is probably not needed; after all the machine reverses at the bottom of the hole and does not lose synchronization there.
One thing I thought about; don't go too slow as in below 200 rpm. There was a thread about breaking taps when rigid tapping, the person was using 200 rpm and when they boosted it the problem disappeared. Once I accidently programmed 100 rpm and the spindle speed fluctuated wildly.
I always use 1000 rpm because this makes it easy to calculate the feet per minute from the pitch, some people use feed per rev. I normally Repeat Rigid Tap if the thread is longer than the tap dia, especially in 1018, but a lot of times in anything. Incidentally check that Repeat Rigid Tapping is turned on; there is a Setting and a Parameter, or two Settings (I think) depending on the age of the machine.
An open mind is a virtue...so long as all the common sense has not leaked out.
Thanks for the advice guys. Sounds like Paulo E said about what I expected.
Hi All,
I have had quite a lot of experience tapping and speaking with others about their tapping problems. I agree with floating the tap a little even when rigid tapping. It really helps out the most when tapping smaller holes with fragile taps ( reducing the chance of breakage) and with larger taps you always seem to get a better thread.
The machine tools and their rigid tapping cycles are not perfect, there can always be a slight fluctuation from 1 hole to another when cycling over and over again. I agree you must start the the cycle at least .100 away from the hole. With regard to the bottom of the hole, I think that as part of the rigid tap cycle there may be a mil-sec dwell parameter built into the cycle for the spindles reversal . For that matter the tension and compression tap holder will always compensate.
On another note I'd like make everyone aware of another great tapping attachment. A Vernon Tap Burr-bit. It enables you to Tap and Deburr in a single operation. They have been in use for many years. Check them out at : http://www.vernondevices.com or at http://www.Itoolit.com
DEAR EVERYBODY WHO WAMTED TO TAPPING ON CNC.
1)FEED BACK FROM CNC CONTROLER
2)RPM /FEED PER REVOLUTION
3)SPEED CHOICE(RPM)
EVERY ONE WILL KNOW BY NOW THAT EXCEPT TAP ALL CUTTING TOOLS USED ON MACHINE HAS NO SELF GUIDE.
EVERY ONE WILL KNOW BY NOW THAT SPINDLE FORWARD & REVERSE ROTATION REQUIRED ONLY FOR TAPPING TO COMPLETE THE OPERATION.
EVERY ONE WILL KNOW BY NOW THAT NO SPINDLE IN THE WORLD CAN STOP & START FROM ANY RPM TO 0 WITHOUT SOME TIME & REVERSAL REQUIRED TIME.
THESE ARE THE NIGATIVES OF TAPPING OPERATION
SOME SMALL HINTS ON THE SAME
TAPPING SPEED CALCULATION 1800/2400 & (2400/4000 COATED TAPS) DIVIDED BY TAP Ø IN MM SHOULD BE THE RPM
DEPENDING ON MATERIAL(THUMB RULE) 1800/M10=1800/10=180 RPM & 2400/10=240 RPM
ALL THE ENCODERS ON CNC WORK ON 0 & 1 FEED BACK SYSTEM
SO PL. SELECT SPEED & FEED.
EVERY TAP HAS A FIXED PITCH & MUST HAVE SOME RELATION WITH RPM
PL.SEE HERE
NC PROGRAME FOR M10 TAPPING 12 MM DEEP
SPEED (RPM)350
TOOL TRAVEL 12+5=17 MM FORWARD & BACKWARD
THIS IS OK
NOE 0 & 1 RELATION 350/ PITCH OF TAP =1.5 =233.3333333333
& TOOL TRAVEL 17MM/1.5PITCH=11.333333333
WHAT GOOD FEEDBACK YOU CAN GET FROM ENCODERS?
SO PL.PROGRAM 351/1.5=234 INTEEGER & 18/1.5=12(START TAPPING ABOVE 6 MM FROM COMPONENT)
NOW SEE FOR SELF THE TAP LIFE & WITH GOOD COMPENSATING ANY ONE WILL GIVE YOU BEST RESULTS.
DURING MY 40 YEARS OF EXPERIANCE IN THE FIELD OF TAPPING & TAPPING TOOL HOLDER MANUFACTURING THIS WAS THE BEST TAPPING PROCESS.
THANKING YOU
WITH BEST REGARDS
PRADEEP R. KHARE
0091 20 26991640
0091 9881747414(MOBILE)
prkhare@hotmail.com
pradeeprkhare@gmail.com
Dude? Why Are you YELLING??
He wants to be heard, of course. India is quite far away. Remember when you were a kid, and used the old tin can on a string trick to talk? That's kinda how their internet service is.
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