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 > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users