Metric Trapezoidal Threads
 

I need to machine some metric trapezoidal threads. Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think maybe it
is since they are for making molds of two mating parts. The molds can't be
of the exact thread forms or the parts won't fit together. A proper cutting
tool for those threads might not produce what I need. I'm still thinking my
way through the process.

Metric Trapezoidal Threads
 

On 12/5/2018 10:04 AM, Bob La Londe wrote:
I need to machine some metric trapezoidal threads.Â* Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach?Â* I think maybe
it is since they are for making molds of two mating parts.Â* The molds
can't be of the exact thread forms or the parts won't fit together.Â* A
proper cutting tool for those threads might not produce what I need.
I'm still thinking my way through the process.



There's guy on Youtube that ground his own tools for making ACME
threads. Same thing as trapezoidal. Only different.
He has a channel.
This Old Tony.

Steve

Metric Trapezoidal Threads
 

"shiggins" wrote in message
...

On 12/5/2018 10:04 AM, Bob La Londe wrote:
I need to machine some metric trapezoidal threads. Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think maybe it
is since they are for making molds of two mating parts. The molds can't
be of the exact thread forms or the parts won't fit together. A proper
cutting tool for those threads might not produce what I need. I'm still
thinking my way through the process.



There's guy on Youtube that ground his own tools for making ACME
threads. Same thing as trapezoidal. Only different.
He has a channel.
This Old Tony.

Steve


****************
Thanks Steve. I actually follow his channel and I've seen the "ACME?
Ac-You" title a few times. I don't think I ever watched it before. Thanks
again.

Metric Trapezoidal Threads
 

"Bob La Londe" wrote in message
...
I need to machine some metric trapezoidal threads. Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think
maybe it is since they are for making molds of two mating parts.
The molds can't be of the exact thread forms or the parts won't fit
together. A proper cutting tool for those threads might not produce
what I need. I'm still thinking my way through the process.

A local vendor who has closed sold me an imported 3-axis angle vise
like this that I use to surface-grind angular and trapezoidal
threading and spline milling bits.

http://www.wikiwand.com/en/Tool_and_cutter_grinder

Metric Trapezoidal Threads
 

"Jim Wilkins" wrote in message ...

"Bob La Londe" wrote in message
...
I need to machine some metric trapezoidal threads. Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think maybe it
is since they are for making molds of two mating parts. The molds can't be
of the exact thread forms or the parts won't fit together. A proper
cutting tool for those threads might not produce what I need. I'm still
thinking my way through the process.

A local vendor who has closed sold me an imported 3-axis angle vise
like this that I use to surface-grind angular and trapezoidal
threading and spline milling bits.

http://www.wikiwand.com/en/Tool_and_cutter_grinder

*****************

The link brings up a CNC tool grinder. If that's what he gave you.... WOW!
I'm impressed.

You reminded my I have an antique (its so old the cords have cloth wrap)
basic tool grinder on the shelf that I saved from going into the dumpster on
a house clean out from a hoarder who passed on. Its halfway apart and
needs to be taken all the way apart, but it might just be a good project to
move up the projects board.

Metric Trapezoidal Threads
 

"Bob La Londe" wrote in message
...
"Jim Wilkins" wrote in message ...

"Bob La Londe" wrote in message
...
I need to machine some metric trapezoidal threads. Both internal
and external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think
maybe it is since they are for making molds of two mating parts.
The molds can't be of the exact thread forms or the parts won't fit
together. A proper cutting tool for those threads might not
produce what I need. I'm still thinking my way through the
process.

A local vendor who has closed sold me an imported 3-axis angle vise
like this that I use to surface-grind angular and trapezoidal
threading and spline milling bits.

http://www.wikiwand.com/en/Tool_and_cutter_grinder

*****************

The link brings up a CNC tool grinder. If that's what he gave
you.... WOW! I'm impressed.

You reminded my I have an antique (its so old the cords have cloth
wrap) basic tool grinder on the shelf that I saved from going into
the dumpster on a house clean out from a hoarder who passed on.
Its halfway apart and needs to be taken all the way apart, but it
might just be a good project to move up the projects board.

I wish! My surface and cutter grinder is a small manual machine from
the 1940's.

The vise is similar to the vise on multiple swivels on the table of
the green manual tool & cutter grinder. I used it for example to grind
a trapezoidal bit to spline a shaft to accept a motorcycle final drive
sprocket, in the transmission on my sawmill.

I machined the shaft grooves slightly too small and pressed on the
sprocket, so the bit geometry didn't have to match exactly.