larger high speed rotary Rasps, or burrs?

penfold said:
Is this it or an approximation thereof?

View attachment 113559
Can you drill and tap? Two pieces of steel sandwiched and screwed together, drill your 26.5mm hole down the join line from opposite ends. Can you soft solder? Same process, but with solder instead of a bolted joint. Even epoxy would do the job, then heat to release afterward.
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Pretty exact :)

I confess I did not see why it was difficult to understand - my use of English obviously needs some polish :(

I did not think of 2 pieces of steel clamped together. I have plenty of clamps, including the drill clamp.

Thanks

Jonathan

I cannot see why it will not work - I'll give it a try. Good idea. Lateral thinking is still alive and kicking.
 
Clamps could work; unless they're unusually hefty G cramps may be too flimsy and the threads are generally too coarse to apply enough pressure, a good drillpress or machine vice would probably do, as would machinist's clamps. I scanned the thread and skimmed past post #11, which is why it took a while for the penny to drop.
 
penfold said:
Clamps could work; unless they're unusually hefty G cramps may be too flimsy and the threads are generally too coarse to apply enough pressure, a good drillpress or machine vice would probably do, as would machinist's clamps. I scanned the thread and skimmed past post #11, which is why it took a while for the penny to drop.
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Nope, your are, or have in your blood - old school Scots engineering - it would become obvious to you.

I have 2 x decent engineers bench vice with would be ideal except they and my big bench drill cannot be 'connected'. I have a vice on the big bench press and can add, if necessary with G clamps, I have collected a variety of sizes.

The slot you drew is perfect - as it is that slot I want to make but the device is slightly more complex.

I'll report back - later.....

Many thanks

Jonathan
 
I might have missed it but I don't recall any reference to the length of the groove. If it is 0.5 mm, a file will do it. If it is anything above 100 mm, the suggestion of drilling down the centreline of two mated blocks will be messy. If the job were given to me, I would clamp it in a machine vice (or if too long, two machine vices) and use a dome ended milling cutter. I would guess about an hour to do the job. (O.k. I have a bunch of CNC machines).
There must be a machine shop somewhere in Sydney?
 
Graham_Wright said:
I might have missed it but I don't recall any reference to the length of the groove. If it is 0.5 mm, a file will do it. If it is anything above 100 mm, the suggestion of drilling down the centreline of two mated blocks will be messy. If the job were given to me, I would clamp it in a machine vice (or if too long, two machine vices) and use a dome ended milling cutter. I would guess about an hour to do the job. (O.k. I have a bunch of CNC machines).
There must be a machine shop somewhere in Sydney?
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Or find a machine shop with a good old fashioned shaping machine. Made for the job!
 
Graham_Wright said:
I might have missed it but I don't recall any reference to the length of the groove. If it is 0.5 mm, a file will do it. If it is anything above 100 mm, the suggestion of drilling down the centreline of two mated blocks will be messy. If the job were given to me, I would clamp it in a machine vice (or if too long, two machine vices) and use a dome ended milling cutter. I would guess about an hour to do the job. (O.k. I have a bunch of CNC machines).
There must be a machine shop somewhere in Sydney?
Click to expand...

I believe there are maybe one or, even, two machine shops in Sydney. I approached one a couple of years ago to make me a prototype bridle plate. The owner apologised and said a one off would cost me A$500. I was supplying the file to allow cutting. I made my own, then had prototypes made in China. It cost me more in air parcel postage to have the prototypes sent than it cost to make. The slot or groove has presented me with a bigger challenge. I like to try my ideas before I invest in 'professional' manufacture - which has worked so far.

I sometimes wish, but then think better of it, I had a bunch of CNC machines!

Jonathan
 
I’m no machinist. I’ve yet to try out the couple of carbide bits I’ve got for my new die grinder...!

But one of the reasons I bought the kit was the seeing the amazing results people (admittedly with more skill than me!) get porting heads and such

So I’d say go for the DIY! Could always use mild steel stock for the first ‘prototype’. Maybe a combo of drilling the clamped pieces and then opening it out with the die grinder?

You never know what one’s own combo of tools, workshop, skill etc. will yield until you try. My combo of these is very modest - but still, sometimes I’m pleasantly surprised by the outcome!
 
Neeves, is there a community of hobbyist metal bashers that you can tap into? Some of them have staggeringly sophisticated machining setups.
 
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