live tooling lathe question

[Bill Henderson]

I am not a lathe guy and our lathe programmer is fairly new to MC.

 

He is using a HAAS.

 

If I have a critical timed point on a thread and it is timed dimensionally to a flat on the part can this be achieved in MC? or the HAAS for that matter.

 

He seems to think the threading starts at a dimension he gives it regardless of spindle orientation.

 

 

Thanks for any input.

[Bill Henderson]

Bump...

 

The tolerance we need to hold is +/-.001 on the ACME and +/-.0007 on the fine thread (not shown).

 

Lead time on getting a gage made is far too long, so we are trying this ourselves.

[Newbeeee™]

Bill - is this really achievable???

The 'slop' (tolerance) on the thread would be way more than your positional tolerance. 7 tenths????

Sorry I'm no help to your question but I would be talking with design about this.

[RObert TImby]

Here is a half a$$ way of doing it. Cut the part, then find the angle you are off to the threads and rotate the geometry to match the thread starting point.

[mkd]

Captain Obvious says:

do it on a mill, so we don't have to think too hard, as thread milling always starts at the programmed point.

 

what do the stated tolerance refer to? dia, pitch, orientation?>

[The_kid]

using the C view utility? should be able to time it corectly if nothing else cut the thread then the flat. assuming this is going to be done on a live tooling lathe?

[Bill Henderson]

Yes on a live tooling lathe.

 

I agree the mill is better.

 

The tolerance is a length from a datum to a point on the thread at a given angle.

 

Military application is all I can say.

 

My image shows a gage we are trying to make to check our part before sending it in for qualification.

 

The gage used by the customer is the only one they have and about 20K plus 8 wks for one to be made.

[The_kid]

this is pretty intresting let me know how you aproach this and get your expected result might be good to know. makes sense good luck.

[mkd]

ah, i see, military doing the usual knuckle headed 10x precision on gauging, which is at least twice as difficult as it needs to be.

I've seen this before.

sounds like you got a vendor issue. thread grinding seems to be the way to go.

 

c-axis interpolating that flat on the haas would be pretty sketchy; it is not made for precision. if you wanna make some fastener hexes fine, but not much more.

[The_kid]

True with the hass the 10X precision would really require glass scales and temp soaking. NL2000 SY anyone?