Hemingway flycutter

My third Hemingway kit since doing their Drawbar and later the ‘simple’ knurling tool 2015:

The 3MT arbor was welded to the Body and with an extension piece screwed in it reached to Hemingway drawbar as do all the other tooling for the Marlow 3A.

The Austin Seven took precedence from 2015 until end July 2019 when I found myself in and ambulance with Blues & Twos on.
I’ve always had a morbid curiosity about what it was like being thus whisked along to hospital, and quite an experience it was.
Having raced saloon cars in the ‘70s I can only say that the driver, a lady Probationary ParaMedic was beyond any criticism, her driving impeccable and only once having to stand on the brakes for some reason, and what a surprise it was at how quickly the ambulance slowed down.
But for their quick action I would not be here today.

Geoff - Trying to keep cool is a loosing battle.

Nice work, Geoff

Keep surviving !!

MichaelG.

Thanks Michael.

Doing my best to do so.

More photos:

I had forgotten just how hard arc weld is as it soon blunted HSS so switched to TC and that produced a perfect finish.
The screw in extension in place, and used on all of my other MT milling tools to bring them all the same height for the Hemingway draw bar to screw into.

In place but needing the tool bit ground:

Geoff - Hemingway kit number 4 soon

I was transferred to Papworth from Peterborough Hospital. Rush hour on the A1 and the two lines of cars simply widened the gap between them and the ambulance going down the middle with siren and lights flashing. The paramedic looked at the speed for me and said 90 mph!

I didn't think I was a real emergency case, it turned out the ambulance crew were based at Papworth and it was a quick way to finish their shift!

Andrew.

Hi Geoff!

Hope that all is now well, and that the Austin 7 is now receiving attention again.

That Flycutter looks to be some beast.

Next, you'll be telling us how you slowed the mill to 20 rpm!

The ngardens need rain jsy as we teperate folk need lower temperatures.

Howard

I find that standard stick to 120 Amps can be quite soft and malleable

If you want a hard weld then wire welding seems to be the way

Looks like things could get pretty warm for you over the next few days, a cool drink under a shady tree with a copy of ME might be the way to go

Thanks for all the comments.

Andrew,
Sounds like a close call for you as well.
The Paramedic who did the test on me said after consulting with the NNUH “You aren’t having one, but we are treating it as a heart attack.
No idea what speed we did but looking out the side window it was pretty quick for the A140 from Scole to Norwich.
Can now do miles of brisk walking, something I had to stop doing years ago.

Howard,
You asked for it!
Can slow the mill down to single figures with ease by way of a VFD in conjunction with the 3-step pulley setup.
The Marlow came with an intermediate 3-step as well but I removed it after installing the VFD.

The very best move was fitting one to the drilling machine that transformed it as now easy to adjust speed to suit drill size.

Ady1,
The Carport is OOB as temp is in the 30s so unbearable for me now.

Geoff - Just replaced battery in iPhone 6s, and a doddle.

Hard to see but what is the shape of the cutter? It looks the wrong way round ie not deepest edge outwards.

Bazyle,

It's just a part ground 1/4” toolbit I had, so any advice on cutter shape please, as I’ve never done one that’s at 90° to work.

Used the bit to produce the square hole.
Oh, after drilling 1/4” first

Geoff - Trying not to melt

As far as cutter geometry is concerned it’s not really any different than facing on the lathe?🙂

Edited By not done it yet on 14/07/2022 10:20:27

not done it yet,

Ah easy to do then, thanks.

Geoff

The thing to remember or get your head around is that the device is moving sideways not downwards. So it is the outer edge of the tool that meets the material first. You might make that bottom outer corner a sharp but fragile one which will leave lot of little grooves on the surface corresponding to your feed rate, or round it off as with a late tool.
Now have a hard think about which where the clearance has to be, and the equivalent of top rake.. You might want to leave that for a cooler day

( for future readers or foreigners it is currently circa 28-30C in the UK which we consider extremely hot although you might be reaching for a coat)

I made mine initially for a normal knife tool, and the (Mk4 or was it5? ) was for a diamond toolbit, like a tangential turning tool (When I can be sufficiently organised to put the bit in the the right way round. Seem to make full use of the 3 wrongs ones! )

Howard

Bazyle,
I do have and used the normal angled flycutter, but will take your advice and experiment with tool edges.
Going to be interesting.

Howard,
Didn’t even think of the diamond tool - Thanks

Geoff - So much cooler today, ready for the furnace to come.

Geoff

The tangential tool works so well in the lathe, it had to be worth a try as a flycutter, even if it sees little or no use.

Might "Come in handy one day"

Time to get out the fan!  (Even the cats seem to like being wiped with a wet clo!h )

Howard

Edited By Howard Lewis on 16/07/2022 11:53:31

Howard,

The hard weld blunted my tangential toolbit hence having to switch to TC.
Fan ready.

Geoff - Keep cool everyone.

Geoff,

I've had the same problem with welds. And mine are so uneven that the interrupted cut chips the edge of the carbide.

You can't win!

But I got there in the end.

Howard