how to calcutate metric pitch.

[cormigu]

Hi guys,

I need to calculate a pitch for M36 X 2MM.

Thanks.

[Tim Johnson]

The pitch is 2.00mm for metric or 2mm/25.4 [.07874] for inch.

 

If you're looking for the pitch dia here's a chart

[Del.]

Im not positive but isn't it (1/25.4)*2

[cormigu]

Thanks guys for replay,I'm looking for the formula for Pitch Diameter.

thanks a lot for help me.

[jeff]

Del,

1mm = 1/25.4 = .039370078

Put the vodka away.

[Cuda84]

I just found this. it seems to work. The results match the minimum pitch diameter in the machinist handbook.

 

H = Cos(30) x P

 

H = is height of thread

P = Pitch 2MM

 

Dp = Dmaj. - 2(3/8)H

 

Dp = pitch diameter

 

I would just look in the machinists hand book.

 

This formula was found on wikipedia.

[Del.]

Del,

1mm = 1/25.4 = .039370078

Put the vodka away.

 

*2

 

 

times 2 stevie wonder

[cormigu]

I was looking for this value,so I don't know really what it is...

I put 0.07874 but it doesn't work ,could someone explain to me why 0.07874 doesn't work .

 

thanks ...

[MotorCityMinion]

Guys, I'm wearing beer goggles at the moment so say something if I'm wrong here.

 

That's correct for a 2mm pitch (.0787), regardless of thread major dia.

 

M36 Major dia. =1.4173". What value did YOU input??? 2.874??

 

Major Dia. - pitch = minor dia. OR... 1.4173 -.0787 = 1.3386 Minor dia. What value did YOU input??? 2.778???

 

Thread depth = (I'm not a lathe hand so bear with me) .0787 / 2 = .0394. What value did YOU input??? .0478???

 

Am I missing something here?

[gcode]

That's correct for a 2mm pitch (.0787), regardless of thread major dia.

 

 

the field in Mastercam is asking for threads/inch

an 8 pitch thread has 8 threads per in or 1/.125 = 8

The 20mm pitch thread would be

1"/20mm

so if you enter

1 / 20mm in the "Threads per inch" field and hit enter.. the problem is solved

 

let Mastercam do the work

[cormigu]

Guys, I'm wearing beer goggles at the moment so say something if I'm wrong here.

 

That's correct for a 2mm pitch (.0787), regardless of thread major dia.

 

M36 Major dia. =1.4173". What value did YOU input??? 2.874??

 

Major Dia. - pitch = minor dia. OR... 1.4173 -.0787 = 1.3386 Minor dia. What value did YOU input??? 2.778???

 

Thread depth = (I'm not a lathe hand so bear with me) .0787 / 2 = .0394. What value did YOU input??? .0478???

 

Am I missing something here?

----------------------------------------------------------------------------------------------------------------------------

 

You right MotorCityMinion,

I was wrong,I did just for an example only.

I think Now it's right.

 

thanks guys

[mwc815]

the field in Mastercam is asking for threads/inch

an 8 pitch thread has 8 threads per in or 1/.125 = 8

The 20mm pitch thread would be

1"/20mm

so if you enter

1 / 20mm in the "Threads per inch" field and hit enter.. the problem is solved

 

let Mastercam do the work

 

I think you need parenthesis there.

1/20mm = .001969

1/(20mm) = 1.27

 

 

Mike

[CAM-mando]

I was looking for this value,so I don't know really what it is...

I put 0.07874 but it doesn't work ,could someone explain to me why 0.07874 doesn't work .

 

thanks ...

It should work although putting .07874 in and selecting the Inches per thread radio button is more straight forward IMO. When you say it doesn't work, what result are you getting? As is pointed out, your diameters are incorrect.

 

/edit... nevermind I missed the post where you figured it out.

[cormigu]

It should work although putting .07874 in and selecting the Inches per thread radio button is more straight forward IMO. When you say it doesn't work, what result are you getting? As is pointed out, your diameters are incorrect.

 

/edit... nevermind I missed the post where you figured it out.

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I did not think about it,your right CAM-mando is much easy selecting the Inches per thread.

 

thanks again.

[GIZMO 21]

it looks like even del's fish had some vodka