Indexable external radius cutters?

[hotponyshoes]

Does anybody know what the proper name for these is or where I can find them?

Ideally with a R5 but i will take bigger

Failing that, a carbide cutter like this but rounder?
To be used on stainless

 

[500e]

https://www.pferd.com/int-en/produc...ons/tungsten-carbide-burrs-with-allround-cut/

 

[hotponyshoes]

I have got some regular pferd ones but it's the shape in the photo I am after, looking for some way to cut round ends onto bits of metal bar

 

[pressbrake1]

What job do you actually want to do ,how many and what material

 

[500e]

 

[hotponyshoes]

What job do you actually want to do ,how many and what material

I have some 304 solid round bar, about 10mm OD.
I want to put a dome / half sphere finish on one end.
The bars are about 1500mm long and already have something fixed to the other end.

So far I have got a decent finish by clamping them in the vice and having at them with a flap disc then going over with a horseshoe rasp then a file then a buffing wheel then a polish. But that is not that quick to do.


What I want is a tool I can buy that will do this for me (for under a couple hundred £)
Failing that, I thought if I can find the radius inserts or a carbide cutter shaped like that I could mount them in a router or something and drill a guide hole through a block at 90deg that I bolt to the router then set it spinning and either clamp the bar and feed the tool onto it or clamp the tool and feed in / rotate the bar by hand.

I would prefer a rounded end as they are locking bars that engage under spring pressure into a plastic retainer so a rounded smooth finish will help with wear on the latch plate.
If needs be I could get away with a cone/taper on the end of the bar (using the type of cutter @500e has put in the pic above) but i think i will then be looking into having metal versions of the catch plate custom made instead!

 

[hotponyshoes]

I was also wondering if I could just get a bench grinder and cut the profile into a course and fine wheel with a dresser but I am not sure how long it will keep its profile if I start by feeding square ended bars into it?
I can find r10 indexables but I'm not sure if I fancy ramming one into a grinding wheel to see if it makes a groove or not!

 

[500e]

You could grind up a lathe tool, a collet would be better than a chuck and marginally quicker.
How meny?

 

[hotponyshoes]

Got about 40. 42 if they dont turn out looking like the 2 I have done!

 

[scott0031]

Make a high speed form tool or super hss or if you have any old cobalt or stellite hss tools (far better than the modern versions) Grind by hand on a bench grinder then stone. . The tool will last very well if looked after and ground correctly. Use a piece or bar of the rad you want as a gauge, in this case the original material you are machining. An hour and a half and its done. Failing that get a cutter grinder to make you a form tool, Its common practice in the trade.

Edit: I didn't read all the replys, but assumed you were doing this in a lathe looking at the original tools you wanted... lathe is the way to go really, I think you mentioned routers this will not end well at all and will destroy the tools in stainless A burr would be better but a halla messy finish to clean up and will still kill the tools. Lathe is the way to go if you have a few to do for speed and finish.

 

[hotponyshoes]

Only problem with using the lathe is the bars are 1.5m long and have stuff attached to one end so I would have to remove that first then reassemble afterwards.
Unless I mount the tool in the chuck and the bar in the cross slide but when I though about doing that I thought it might be easier to make a tool that I could take to the bars...

 

[pressbrake1]

I would mack up a tool with a guide like a pipe threading die head.
Then have a form tool fixed to it
As said earlier you need some old school hss

 

[Hood]

Plenty of rad cutters here of various styles and materials (and prices )
https://www.cutwel.co.uk/Corner-Rounding-Milling-Cutters
If you have a lathe I would mount a clamp on the cross slide or in the toolpost for the part and have the cutter in the spindle, that way you can have minimal overhang of the bar.


Edit
Actually that may not work as the part would need spun I think. Or rather I am not thinking today, body is aching, think I have Corona

 

[Brad93]

Should of been done in a lathe with a collet chuck and either a form tool or a radius turning (ball turning attachment).

Easiest way to do it now is with a linisher and a few grades of ceramic belt.