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MT end mills slightly corroded

(How to restore)

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Dr. MC Black08/05/2021 18:50:38
228 forum posts
1 photos
Posted by bernard towers on 08/05/2021 18:40:29:

you don't make it clear if they are tanged or threaded, the ones I have are tanged and are under the bench and thats where they will stay

They have Morse Taper 2 shanks.

I did NOT notice any threaded holes for a drawbar but they are presently in the shed and it's cold outside.

Does that make a difference as far as cleaning up the taper is concerned?

They are quite large sizes and I would like to avoid throwing them away, if possible

Emgee08/05/2021 21:01:10
2047 forum posts
258 photos

I have some with 6 flutes on MT3 tanged shanks, use them occasionally on the lathe from the tailstock to bottom out drilled holes before boring. Never tried to use them as milling cutters in a spindle but I guess that was one of their uses when new.

Emgee

not done it yet08/05/2021 21:14:53
5946 forum posts
20 photos

the ones I have are tanged and are under the bench and thats where they will stay

No problem at all as long as they were used to cut axially?

old mart09/05/2021 17:29:49
3067 forum posts
194 photos

I would also avoid using any tanged cutter sideways, it is looking for trouble. That is why mills use drawbars.

Dr. MC Black10/05/2021 00:44:59
228 forum posts
1 photos
Posted by old mart on 09/05/2021 17:29:49:

I would also avoid using any tanged cutter sideways, it is looking for trouble. That is why mills use drawbars.

Which prompts me to ask why does anybody manufacturer tanged MT2 End Mills?

MC

mgnbuk10/05/2021 07:56:35
992 forum posts
69 photos

Which prompts me to ask why does anybody manufacturer tanged MT2 End Mills?

Spot facing ?

Nigel B.

Graham Meek10/05/2021 08:03:11
340 forum posts
231 photos

Morse Taper cutters that resemble an endmill, but have a Tang, and not a Tapped hole, are usually used to produce counterbores. The thrust from the cutter during counter-boring tending to push the cutter into the Morse socket, rather than winding it out during milling.

Without the tapped hole it would be foolish to use these for milling unless one wants to lead an exciting life, with a possible visit to A&E thrown in for good measure.

Regards

Gray,

Dr. MC Black10/05/2021 10:38:51
228 forum posts
1 photos
Posted by Graham Meek on 10/05/2021 08:03:11:

Morse Taper cutters that resemble an endmill, but have a Tang, and not a Tapped hole, are usually used to produce counterbores.

That's very useful information which I shall bear in mind.

Unfortunately, they are NOT marked with size; I shall see if I can determine those.

MC

Nicholas Farr10/05/2021 10:59:23
avatar
2809 forum posts
1274 photos
Posted by Graham Meek on 10/05/2021 08:03:11:

Morse Taper cutters that resemble an endmill, but have a Tang, and not a Tapped hole, are usually used to produce counterbores. The thrust from the cutter during counter-boring tending to push the cutter into the Morse socket, rather than winding it out during milling.

Without the tapped hole it would be foolish to use these for milling unless one wants to lead an exciting life, with a possible visit to A&E thrown in for good measure.

Regards

Gray,

Hi, however this type with a left hand spiral and a right hand cut, should in theory, tend to push the cutter into the taper.

1 M/T Tanged Counterborers

Regards Nick.

not done it yet10/05/2021 12:21:45
5946 forum posts
20 photos

I shall see if I can determine those.

Easy enough. Drill a hole as a pilot, apply cutter axially, then measure the new hole diameter.

Dr. MC Black10/05/2021 12:25:43
228 forum posts
1 photos
Posted by not done it yet on 10/05/2021 12:21:45:

I shall see if I can determine those.

Easy enough. Drill a hole as a pilot, apply cutter axially, then measure the new hole diameter.

I was thinking of using a Digital Caliper across the end to measure the diameter directly.

I appreciate that this would NOT work with an odd number of flutes.

I think the cutters are too large for any drill gauges in my possession.

MC

not done it yet10/05/2021 13:27:04
5946 forum posts
20 photos

In my view, the practical hole size cut is likely more accurate than the theoretical assumption (of concentricity).

Graham Meek10/05/2021 14:17:17
340 forum posts
231 photos

Hi, however this type with a left hand spiral and a right hand cut, should in theory, tend to push the cutter into the taper.

1 M/T Tanged Counterborers

Regards Nick.

Hi Nick,

That might be true, re cutting forces, but in my experience these type of cutters are more likely to be "end cutting reamers". Many of the chucking reamers I have are LH spiral.

They may well work as an endmill, but if they were mine I would cut the Tang off and tap for a drawbar. The other problem with these cutters is not all of them are HSS, I have been given some which were Carbon Steel.

Regards

Gray,

Dr. MC Black10/05/2021 18:29:10
228 forum posts
1 photos
Posted by not done it yet on 10/05/2021 13:27:04:

In my view, the practical hole size cut is likely more accurate than the theoretical assumption (of concentricity).

Further to previous, all four of the cutters are right hand with an even number of flutes.

I found that I did have some thread gauges with large holes and determined that two are 1/2", one is 9/16" and the last is 1".

But one of the Morse Tapers has been machine to a fairly constant 15mm and fits in a collet.

I'm now seriously considering machining the other three in a similar way. Unfortunately, the spindle on my lathe isn't sufficiently large to hold these End Mills while I machine the tapers to parallel.

The Scotchbrite arrived today but I may no longer need to use it!

MC

MC

Chris Gunn10/05/2021 19:02:59
381 forum posts
26 photos

I'm with Bernard, if they were nice and shiny I would still not use them for milling. There is probably a reason they are rusty and you got them for free. Once you have cleaned them all up and you have modified them by turning the shank down or adding a drawbar to possibly make them safe to use, they will give you limited service for all the effort before they need sharpening again. they may put you off milling as well. Put them back under the bench, and buy some modern ones, and buy the sizes you need.

Chris Gunn

Dr. MC Black11/05/2021 00:55:52
228 forum posts
1 photos

I was given a lot of tooling by an old chum whose wife decide that they would be moving into a flat so he had to give up his workshop which was larger than a double garage.

These End Mills have never been under MY bench - generally, I don't keep this sort of thing in my shed but in my centrally heated home from where I take what's needed to the shed.

They will go into the forthcoming projects drawer until I can get the use of a bigger lathe using which I can turn the tapers parallel.

Looking at the cutting edges, they look to me as if they have had little use and will probably last me out.

Chris Gunn11/05/2021 11:25:42
381 forum posts
26 photos

I just had another look at the pics of the end mills, and note what could be a hole in the end. Hard to tell if it is a centre or a hole. If it is a parallel hole they could be countersinks, with the hole being provided for a pilot. I have some similar under my bench, complete with pilots.

Chris Gunn

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