[gunmaker]

I ran a rigid tapping cycle on my "new" 2006 RH19 cent7 the other day. I used a Jacobs chuck to hold the tap. When I took the tap out of the chuck and screwed it into the hole it just tapped, it seemed kind of sloppy. Years ago, I worked in a shop running a Mazak VTC20B and tapped tons of holes using nothing but a Jacobs chuck to hold it. Tapping stainless, 6AL4v Titanium, 4140, 1018 and never remember having a sloppy hole. Sizes from 1/2-13 down to 6-32. They all came out perfect.

Is my sloppy hole from the toolholder? should I be using a toolholder that has some tension and compression?

What do you guys use?


Thanks

[Jim Dawson]

I normally use an ER collet to hold taps for rigid tapping, both on the lathe and mill. But for maximum accuracy, I think a dedicated floating tap holder would be the best choice. The Jacobs chuck could have a bit of runout and if the tap is stiff enough it might be able to cut a bit off center and tap the hole oversize. A floating tap holder would cause the tap to follow the hole.

Also, you might look at the fit class of the tap. And confirm that your hole is the proper size.

[gunmaker]

Do you use a tap collet? or just a standard collet?

[Jim Dawson]

Do you use a tap collet? or just a standard collet?

Just a standard collet.

[mactec54]

Do you use a tap collet? or just a standard collet?

You should use the tap collet then the tap is driven how it is meant to be, a ER collet can be used but only as a substitute if you don't have the correct collet I don't use drill chucks on CNC mills they are not rigid enough and hold very poorly they where only designed to hold drills not a Tap

Do you need tension and compression, only if your machine can't do true Rigid Taping

[Chris D]

Why would you use a tension compression tap holder on a machine that is capable of rigid tapping? That is sort of an oxymoron.

[Jim Dawson]

Why would you use a tension compression tap holder on a machine that is capable of rigid tapping? That is sort of an oxymoron.

I would use one to solve a problem that didn't otherwise have an easy solution.

[machinehop5]

See something about G63 Tapping and G84.2 Front synchronous tapping cycle for Mazak's....maybe
http://www2.i-logic.com/manuals/Maza...l%20Matrix.pdf

[mactec54]

See something about G63 Tapping and G84.2 Front synchronous tapping cycle for Mazak's....maybe
http://www2.i-logic.com/manuals/Maza...l%20Matrix.pdf

He is not using a Mazak machine

[gunmaker]

The last machine I rigid tapped on was the Mazak back in '98. My "new" Milltronics 2006 RH19 cent7 is what I'm asking about. Does the hard tap fudge factor have anything to do with the quality of the synchronous feed? My mill is a 220V/3ph machine running on 243V/3ph. Not sure if that would have any adverse affect.

[Jim Dawson]

The last machine I rigid tapped on was the Mazak back in '98. My "new" Milltronics 2006 RH19 cent7 is what I'm asking about. Does the hard tap fudge factor have anything to do with the quality of the synchronous feed?

The Z feed should be electronically geared to the spindle encoder at some ratio based on the thread lead. If the ''fudge factor'' adds a variable to the Z/spindle encoder ratio in the rigid tapping cycle, then yes, it would have an effect. Maybe the fudge factor is to compensate for some latency in the system? I don't know, never heard of this before in a system.

My mill is a 220V/3ph machine running on 243V/3ph. Not sure if that would have any adverse affect.

I would not expect the voltage to have any effect on the tapping cycle. Seems like the voltage is in the acceptable range.

[mactec54]

The last machine I rigid tapped on was the Mazak back in '98. My "new" Milltronics 2006 RH19 cent7 is what I'm asking about. Does the hard tap fudge factor have anything to do with the quality of the synchronous feed? My mill is a 220V/3ph machine running on 243V/3ph. Not sure if that would have any adverse affect.

" Voltage problem " None what's so ever, you sure you have rigid taping as most machines that was an extra and if it does not have then that would explain why you are having a problem you would have to contact Miltonic's to see if it was active for your machine

[greggv]

I don't get the fudge factor? If there's any fudging going on, you had better be using a tension / compression holder. I use those on my Haas VF4, even tho it does have rigid tapping. I feel they take up any small bit of slop or play in the electronic gearing. Plus they have quick change tap holders.

[positiverake]

Attachment 420716 This is what I use, it uses quick change tap holders and does have a little movement but is Rigid, works great

[gunmaker]

Attachment 420716 This is what I use, it uses quick change tap holders and does have a little movement but is Rigid, works great

Any more info on that?
Thanks

[ToolHIT]

You will want a Tension/Compression Tap Holder with the Axial Compensation like the picture above. The collets have the square drive for the tap and holder itself has .290" Tension and Compression to compensate in the Z. They are offered in either Series 1 that goes from #6 to 9/16 tap sizes or Series 2 which goes from 5/16" to 7/8" Tap Sizes. Here are links to each to help you out:
CAT40 TC Series 1 Holder
CAT40 TC Series 1 Tap Collets
CAT40 TC Series 2 Holder
CAT40 TC Series 2 Tap Collet

Or you can get Axial Compensating ER Tap Collets that is a much more economical option if you already have ER Collet Chucks. These will fit into your existing ER Collet Chuck (from ER16 to ER40) and they have the square drive along with the axial compensation you need. Here is a link to them:
ER Axial Compensation Tap Collets

Hopefully this helps you out!

Mike

[gunmaker]

pretty sure it has rigid tap. looks like it came standard on the RH19
MillT by JAMES ANDERSON, on Flickr

[mactec54]

pretty sure it has rigid tap. looks like it came standard on the RH19

It may have but above that list it says RH33 no reason for the RH19 not to have it, what was the code you used just past it here

[gunmaker]

It may have but above that list it says RH33 no reason for the RH19

The RH33 is the end of the sentence above about the box ways. The RH19 has dovetail for the X.

I programmed it in conversational using the rigid tap toggle option.

No high or low range.

[machinehop5]

Does this machine have High/Low range Spindle? Try using High Range with G88 Hard Tapping