Help with this milling tool holder

[choochoo_balooParticipant @choochoo_baloo]

I am in contact with the owner of a Emco F1 CNC mill, with a view to buying it, and he has attempted to describe the included tool holder. Obviously I want to check that I can easily get new tool holders. It's called "SK 30".

I am pretty unfamiliar with milling machine, so hope someone can fully identify this holder; I'm struggling to find SK30 holders from the usual hobby suppliers.

I have attached both a screenshot from the manual, and a photo of the current holder. Any help gratefully received.

[choochoo_balooParticipant @choochoo_baloo]

[JasonBModerator @jasonb]

There was a recent thread discussing the various versions of teh "30" tooling, have a search. Basically the taper is the same but the drive method, retaining method and spigot on the end vary slightly.

EDIT this thread

Edited By JasonB on 05/09/2017 08:06:10

[SteveIParticipant @stevei]

Hi,

I think it is probably the case you can easily find tooling, my initial guess is its BT30. However it would be nice to get a picture with a different angle as I can not make out the drive dog cut outs, or the profile of the area which the tool changer clamps on and off. If you have the tool to hand and do a web search you can check the basic dimensions to be 100%.

 

SK — roughly translates as Short Taper which is a European description for the self releasing milling machine spindle taper standard that we know as NMTB (National Machine Tool Builders) taper family. Basically it is a 24/7 taper defined in the USA in the 1920's.

 

The number 30 denotes the size of the tooling. There are various standards and 30 40 and 50 are the most common. 30 is very common and getting 30 taper tooling in all its variations is not a problem. 40 taper seems to be the cheapest new as I suspect it is the most commonly made these days.

 

There are many variations of this basic 24/7 taper tooling and you need to get the correct variation to ensure compatibility. In your picture the tool has a pull stud which is common in CNC machines for tool retention in the spindle and the flange is suited to a tool changer carousel so from that we can infer it is probably either BT30 or CAT30. BT is common in Europe and is defined using metric, i.e. the thread for the pull stud is M12 on BT30 metric.BT30 spindles have symmetric drive dog arrangement so the cut outs in the tool flange are symmetric.

 

http://www.tools-n-gizmos.com/specs/Tapers.html

 

Good luck

Steve

 

EDIT Jason beat me to it.

Edited By SteveI on 05/09/2017 07:29:53

Edited By SteveI on 05/09/2017 07:40:11

[choochoo_balooParticipant @choochoo_baloo]

Thanks both. From this and the linked thread (I did do search before posting, clearly my search words weren't accurate), I'm confident I need:

DIN69871 (aka SK30/SK40/SK50)

I've had a look at the Bison Bial catalogue, and am now confused by yet more choice!! What type would you advise for use as additional tool holders? Obviously I'll only be doing common home milling tasks (e.g. centre drilling, end mills, involute gear cutters etc.); ER collet chuck type?

[BazParticipant @baz89810]

Choochoo baloo these holders should be available from Emco at Hayling Island. The holders do not have drive slots or threaded in pull studs. The holder and pull stud is all one piece and also soft. If you have one as a pattern you could possibly make your own.

[HOWARDTParticipant @howardt]

You will also need a pull stud, the bit screwed in to the small end of the taper. Pull studs have many variations, not only the thread to match the holder but also the noble on the end to match the drawbar.

[choochoo_balooParticipant @choochoo_baloo]

Forgot to upload the Bison Bial catalogue page of interest:

[DrDaveParticipant @drdave]

I have bought a couple of BT30 tool holders in the recent past for my F1: a drill chuck and ER25 collet holders. A Type 1 45 degree pull stud with M12 thread does the job. The BT30 holders that I have bought have a pair of cut-outs for drive dogs, which the genuine Emco parts do not, but these are not really needed.

They are great little mills. Pity it is not a bit bigger.

Dave

[EmgeeParticipant @emgee]

I can confirm all DrDave says, definitely BT30 on the std Emco toolholder, has ER25 collet bore.T

he advantage of the Emco holder is the collet is recessed so reducing tool overhang from the spindle. It is also possible to modify ISO30 and INT30 holders by cutting off the parallel end and tapping deeper for a pull stud.

Emgee

[Ex contributorParticipant @mgnbuk]

Cutwel have ER collet chucks in SK30

**LINK**

If I ever make room in the garage to get my ex-industrial Triac out of storage, I'll be looking for 30 taper tooling as well.

Nigel B

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