[CEMENTHE4D]

We have a job that details a square taper as...
______________________

.50 PF LARGE END
OF SQUARE .75
PER FOOT TAPER
(TOTAL)
______________________

The "PF" is throwing me off. I'm assuming Press Fit?

Never seen it detailed like that before.

TIA ~CH

[mactec54]

We have a job that details a square taper as...
______________________

.50 PF LARGE END
OF SQUARE .75
PER FOOT TAPER
(TOTAL)
______________________

The "PF" is throwing me off. I'm assuming Press Fit?

Never seen it detailed like that before.

TIA ~CH

The PF is per foot taper without seeing the drawing it does not make much sense the way that this is written

[CEMENTHE4D]

The PF is per foot taper without seeing the drawing it does not make much sense the way that this is written

It's written exactly the way I typed it out. only thing missing is the Arrow pointing to the square on the end of a shaft.

[mactec54]

It's written exactly the way I typed it out. only thing missing is the Arrow pointing to the square on the end of a shaft.

Is there a thread involved

[CEMENTHE4D]

Is there a thread involved

.375-16 UNC 2A on Square end and a 1.5-4 acme on the shaft.

[mactec54]

.375-16 UNC 2A on Square end and a 1.5-4 acme on the shaft.

It makes a little more sense the PF is not per foot it is a reference to a Thread JIS PF series thread so it is basally saying a Parallel Pipe thread, but your threads don't match up to that so still unknown as to what they mean, unless the thread was changed at some time, what is this drawings origin

[peteeng]

Hi - This wiki says PF is press fit. Peter

https://en.wikipedia.org/wiki/Engine...ns_and_symbols

[mactec54]

Hi - This wiki says PF is press fit. Peter

https://en.wikipedia.org/wiki/Engine...ns_and_symbols

It is not going to be a Press Fit with a +/- .010" tolerance

Note how it is used P.S. = Press Fit not just straight PS = Parallel thread for Jis standard, so it has more than one meaning depending on how it is written and what it is referring too

I wonder if the Machinery Hand Book has how it should be used