how to make the semi-circle section on a tube bender die using a lathe

It would be easy on a lathe with a spindle mounted cutter (just use ball end mill), but what about on a lathe with a standard low tech stationary cutter?

Trying to figure out an economic way to make these things - the retail price for a set is $625.

thanks in advance!

Reply to
Loading thread data ...

======================= I don't mean to belabor the obvious, but as this is alt.machines.cnc, do you have a cnc lathe?

If so, an old technique may help. If you lathe has enough swing, rig a faceplate. It will be an interrupted cut so HSS may better than carbide, but G2/G3 and lots of patience may be a solution.

If a strictly manual lathe you can use the method described in one of Lautard's "Machinists Bedside Readers" to generate a radius using a series of plunge cuts. see

formatting link
and several of the catalog tool supply houses also carry these books. This is not a actual radius but series of tiny steps that approximates a radius, most likely good enough as machined, or file/polish to suit.

What equipment do you have available and what are the sizes of the dies?

Unka George (George McDuffee)

...and at the end of the fight is a tombstone white with the name of the late deceased, and the epitaph drear: ?A Fool lies here, who tried to hustle the East.?

Rudyard Kipling The Naulahka, ch. 5, heading (1892).

Reply to
F. George McDuffee

The dies are about 6" in diameter.

CNC vertical mill, manual lathe.

I just figured out that I could put the die on a shellmill holder (in the vertical mill spindle), put the cutting tool in the vise and do a Z axis interpolation on the mill.

Thanks for your suggestions!

Reply to

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.