Kondia Powermill Milling Machine.

[doubleboost]

proper feeds and the Spanish make some proper machines. if its 30 int r8 tooling will still fit

R8 is not compatible with int30

 

[MattH]

R8 and 3MT are roughy the same size and capacity.
Both are driven via the taper, MT can be hard to eject due to the shallow taper and need more force on the drawbar for the same reason.
R8 has a steeper taper so ejects more easily.

INT tapers have drive dogs and a much bigger taper so are capable of much more power transfer and rigidity.

 

[Seadog]

The taper is the same and so is the major gauge dimension, 1-1/4," but the'tail end' is completely different. It's 15/16" on the R8 and a gnats under 5/8" for the INT30.

 

[Barking Mat]

Ok, to not sound too daft, I googled 'int drive dogs' first listing in german, second listing Asian dog driving scooters.

what's a 'drive dog'?

 

[Seadog]

The two squares pieces on the face of the spindle.

 

[Barking Mat]

Going back to cylinder head skimming, isn't a 12" fly cutter massive? The last few cylinder heads I've had done have been done with a grinding stone, 'like' a bench grinder. I initially thought that tilting head might go to 90 degrees, but looking again I don't think it will. Couldn't you do numerous passes with a smaller fly cutter? Or is that just silly?

 

[MattH]

It’s two square pegs on the spindle nose that engage with the end of the tool holder to transfer the drive.
Look at the two cutouts in the picture I posted.

If you look closely at the pics of the mill you posted you can see the dogs so you can tell it’s an INT spindle nose. It’s hard to tell whether it’s 30 or 40 and these size mills could come with either.
I’ve only seen 30 on Breavers though. Most mills this size are 40.

 

[MattH]

Going back to cylinder head skimming, isn't a 12" fly cutter massive? The last few cylinder heads I've had done have been done with a grinding stone, 'like' a bench grinder. I initially thought that tilting head might go to 90 degrees, but looking again I don't think it will. Couldn't you do numerous passes with a smaller fly cutter? Or is that just silly?

Most setups I’ve seen are similar to this:

 

[Barking Mat]

Thank you @Seadog and @MattH for clearing up the drive dogs, I don't know how you can see that.

From my not extensive knowledge of skimming heads, one local machining company to me refused to do ally heads as there fly cutter left small gouges apparently, no issues with cast iron heads.

The motor racing company next door use a stone polisher, which gives immaculate results, first time I'd come across that.

 

[MattH]

Make a fly cutter with a carbide insert, use positive rack polished inserts.
Highest RPM’s machine can handle and slowest feed.
This will get you a mirror finish.

 

[Barking Mat]

I appreciate what you're saying @MattH, just looking at the photos that's a long horizontal slide on the head, so the head could be tilted to 90 degrees, and work as a horizontal mill?

 

[MattH]

Bridgeport’s and their clones have been so successful because the rotating and extending ram and the rotating and nodding head make them extremely versatile.
But it does make them less rigid. The bigger clones, like the one you have posted are better machines because they are heavier and more rigid.

They can cut with the head rotated 90degs so are horizontal, but they aren’t horizontal mills in that they don’t have and arbour.

 

[Barking Mat]

Thanks all, I'll keep you posted as this advances, sure I'll have a load more questions.

 

[graffian]

I don't use the taper to hold my flycutter, I don't seem to have any pics of it.
I have a ring that clamps around the spindle and a bit of 2x1 or 3x1 steel about a foot long that bolts to the
face of the ring. I use carbide inserts as cutting tools. I also have a 3mb land rover flywheel that bolts to
the same sort of thing.

 

[pressbrake1]

R8 is not compatible with int30

I meant the other way around, you can use 30int in r8 . Seen it with my own eyes as explained in a later post. Check machinery handbook for dims and you will see same taper.
If I hadn’t seen it myself I wouldn’t believe it either

 

[pressbrake1]

So similar to a MT, just a different format, or is it tapped at the top for a locking bolt?

Morse are locking taper ints and R8 are not , though in practice they can and do

 

[pressbrake1]

Of no use to the op but this is a fly cutter I made to bolt to the sae flange of a 50int mill. Uses carbide and hss

 

[Hood]

I meant the other way around, you can use 30int in r8 . Seen it with my own eyes as explained in a later post. Check machinery handbook for dims and you will see same taper.
If I hadn’t seen it myself I wouldn’t believe it either

I think the angles are slightly different from memory. Not a lot in it but....

 

[minimutly]

You can quite happily fly cut aluminium heads with a flycutter. I have a 2inch thick, 9 inch diameter single point flycutter on an int 40. The one thing I refuse to do are diesel heads with steel inserts.
The mill is an old FritzWerner, I think it was used to make bombers...

 

[pressbrake1]

You can quite happily fly cut aluminium heads with a flycutter. I have a 2inch thick, 9 inch diameter single point flycutter on an int 40. The one thing I refuse to do are diesel heads with steel inserts.
The mill is an old FritzWerner, I think it was used to make bombers...

I used to have a plough grinder if used for heads with proud hot spots.