I just hold the taps in standard er collets.  Mostly er32 and er40.

Never slip.

And just tapped 300 holes awhile ago in the cnc

Biggest  I have tapped is m14 and it didn't slip

On Fri, 10 Dec 2021, 21:45 John Dammeyer, <jo...@autoartisans.com> wrote:

> Well there are standards but more and more it doesn't look like they are
> being followed.
>
> Since this forum is all about CNC my request follows with the subject of
> power tapping.  To hold the taps so they don't spin in the collets I found
> what are called Tap Collets in the ER20 size.  The attached chart shows the
> sizes and the photo is of the JIS variety.
>
> The collets are slit 4 ways on each end rather than 8 so they are not
> nearly as flexible.  Where an ER20 collet might be rated as 5mm-6mm or
> 6mm-7mm the tap collet is marked [M6 6.3-5] or [M8 6.3-5]
>
> If you have an ISO 6.0x1.0mm tap the shaft part will be 6.3mm and the
> square, which fits in the square part of the collet to prevent the tap from
> spinning, will be 5mm square.
>
> When my 6mm tap didn't fit in the M6 collet I complained to the supplier
> and got the same shrugged shoulders.   However both my M4 and M5 taps fit
> into the M5 collet which is also wrong.
>
> So I thought I'd buy American and order an M5 and M6  for $20 each.  The
> taps arrived with several part numbers and Made in USA laser engraved on
> them.  The shaft measured 6.42mm and wouldn't go in.  The Chinese 8mm tap
> with the 6.3 shaft went smoothly into the collet marked M8 (or M6).  And it
> measured exactly 6.3mm.
>
> To get the tap in I resorted to force.  I jammed 3 thin bladed flat
> screwdrivers into three of the slots on the collet.  The US M6 tap now
> dropped into the now larger than 6.4mm hole and an 1/8 turn twist of the
> tap made it drop further into the square hole.  Pull the screwdrivers and
> the tap was held tight.  Tighten the collet and the TTS ER20 appears to
> turn the tap true.
>
> All this is of no importance, as demonstrated by the huge forum response
> of actual tap measurements, unless you have specific holders for tools that
> are supposed to be of a specific dimension.  Then it is important.   And
> I'm sure there are those who hold it in a drill chuck and have no problem
> with it spinning in the chuck. Or in a standard collet without issues.   I
> don't seem to have that luck.
>
> Anyway.  My request for measurements was to try and get an idea of how
> widespread tap shank and square variations are.
>
> John
>
>
> > -----Original Message-----
> > From: Roland Jollivet [mailto:roland.jolli...@gmail.com]
> > Sent: December-09-21 9:22 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: [Emc-users] Tap size
> >
> > There is no standard, but mine are  �6 and 5.85mm
> >
> > To illustrate, here are two M4 taps from the same supplier, YG. Obviously
> > SF and SP, but the main difference is that the one on the left was bought
> > about 5 years ago.
> > What you see is shrinking, just like your packet of biscuits is getting
> > smaller...
> >
> > I got mad at the vendor, because the new style has less reach and is more
> > difficult to handle. He just shrugged his shoulders..
> >
> > Roland
> >
> >
> >
> >
> > On Thu, 9 Dec 2021 at 23:01, johnd <jo...@autoartisans.com> wrote:
> >
> > > Mini surveyIf you have an M6 x1.0 tap in your tool box what is the
> shank
> > > and flat dimension?Sent from my Samsung S10
> > > _______________________________________________
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >
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