Looks like they still have them in stock.

In a case like this, you have to ask what commercial incentive would exist for someone to produce such a device.

A standard 30 INT to Morse adaptor is used for holding drills, reamers, etc, which have a tang on them and thus the adaptor is made to accommodate the tang.

People will not make things they cannot sell and your use case is unusual to say the least.

Since a Morse taper is non-self-releasing, why do you you feel a drawbar is necessary? What forces will be on your boring head that will encourage it to pull out of its seating? It is not a milling cuttter whose cutting geometry is such as to pull it into the work.

You say the flats interfere with the drawbar, but I guess that is with respect to the 3/8" drawbar. Could you not bush the boring head and use an M6 drawbar that will pass the flats (2 Morse has 1/4 A/F according to diagrams I have seen)?

Chuck up the adaptor you have in a lathe and poke a 10mm carbide mill down from the top end to create the space you want.

I have an adaptor but the flats that engage with the tang of the Morse taper interfer with the drawbar.

Why not simply bore out the adaptor to 3/8” clearance? End of problem?

Chronos do 1.5" x 18 on INT 30 which is a common boring head thread and would save loosing head room, other threads listed too

If you follow the links in Mine and Jelly's posts they take you to adaptors with a male INT30 to fit his spindle that have a MT2 socket so not sure what suggestions you ar elooking at?

My Chronos link will save height by removing the MT2 shank from many boring heads and they can be fitted to the arobr's thread and pokes straight into the int30 Spindle nose

Yup! I was wrong.

Hi Bob,

I am a little confused.

A. First sentence suggests tang on Morse taper interference with drawbar. Do you mean tang of MT tooling interfering with drawbar which holds INT30 in place on your machine?

B. Your second sentence suggests needing an INT30 with through hole to enable use of 3/8” drawbar to pass through the INT30 adaptor to engage onto MT2 tooling which has 3/8”whit. female thread.

Notes:

1. All the INT30 to MT2 adaptors sold by ARC have an M12 thread to hold INT30 in place.

2. All/most MT2 tooling have 3/8” or M10 drawbar thread. The INT30 adaptor has an M12 thread. So, to the best of my knowledge (which is a little rusty):

a. As long as you have a through hole in your mill head, you can make a 3/8” drawbar/studding long enough to engage directly through the adaptor into MT2 -3/8” female tooling. Similarly, you can make and use 10mm drawbar/studding long enough to engage directly through the adaptor into MT2 – 10mm female tread tooling.

b. Some machines have a captive drawbar in the mill head, to hold INT30 tooling in place. In such cases, one needs to find out and be aware of what is the thread of the existing drawbar in the machine, and how easy/difficult it is to access or change, and do you really want to. INT30 tooling do come in different female thread configurations. This is when things become interesting, and certain changes in drawbar may need to be considered.

As it stands, I would suggest reviewing the drawbar arrangement on your mill for the existing INT30 tooling, and adaptor you have in hand, before considering a new purchase.

If I am wrong in my thinking or have misunderstood something, please accept my apologies as its been a while since I looked at this product, and I am semi-retired, leaving the younger generation headed by Ian Davidson to run daily business.

Ketan at ARC

Further note..: Chronos link suggestion made by Jason is good… especially when using new boring heads to screw directly onto INT30 arbors. However, to unscrew existing boring heads off existing MT2 arbors can be difficult, as they can friction weld (for want to phrase) over time… especially if they have been involved with interrupted cuts over a certain period of use.

Oh… I see thank you.

Ketan at ARC

Bob

I think there is ‘the makings of an idea’ in this thread from 2019 : **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=146603

Whether there is any conveniently available ‘thing’ available to modify … I know not.

But the point is … you don’t really need the male INT 30 … there are four tapped holes available on the spindle nose … nicely illustrated here : **LINK**

Tapers – sizes

It’s time for you to get the sketchbook out, or fire-up the CAD, methinks !

MichaelG.

[ hoping to get back to sleep now ]

I understand clearly now. Thank you for the clarification Bob.

Ketan at ARC

I decided to visit the warehouse to have a look at the said products.

Took some pictures which are presented below.

You were right about the tang type adapator. the hole is indeed around 6mm, so impossible to get 3/8" Whit drawbar through it:

On opening the box which was supposed to contain ISO/INT30 to MT2 adaptor (drawbar type), I discovered that we had BT30 type instead!.. Left message for Ian and team to check the stock in our warehouse next door on Monday.

BT30 will fit INT30/ISO30 taper, but INT30/ISO30 will not fit in BT30 taper mills. So in your case, the BT30 adaptor will be fine. However, after checking our stock, Ian or a member of our team will give you a call to see how you wish to proceed.

Then I put in a MT2 boring head arbour into the BT30- MT2 drawbar type adaptor, and used a 3/8" drawbar to see if it will go through without difficulty… and this was fine.:

Thank you for raising my curiosity.

Ketan at ARC