[Azalin]

Unfinished pull stud grippers.

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[Azalin]

It took some time to finish the first gripper because I was busy with other things but here it is. Jaws made from ck45.

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[Azalin]

And here I am on the design at the moment.

[Azalin]

What is the correct angle for ISO20 taper? I mean what the angle of the spindle taper should be?

[ihavenofish]

um. shoudlnt that have been the first step here?



taper for ALL steep taper type tooling, regardless of size is 7 in 24.

which means, your profile reference points for angle are are 3.5 units radially, 24 units axial. with an opening of 22.225mm (7/8") diametre.

[Azalin]

Soo, does that make 16,5943?

[ihavenofish]

i hope not. your tools will fall out.

it should be half that per side.

i assume you need the actual angle for manual lathe?

[Azalin]

Hi again,

It's a CNC'ed lathe.

According to my calculation the angle of the line is 188.29715° however, I just tried to cut the taper on aluminium but it is narrower on the large size so there is a little play on the small side. What did I miss?

[Mecanix]

AL is not cheap :/ Can we see your sketch's dim or part's pmi?

[ihavenofish]

al is cheap AF :P
better to screw that up than A2

this is also why you dont use angles. use the 7 in 24 measurements.

difficult to know what has gone wrong, without knowing you use 7 in 24 to start (and not some rounded off angle)

[Mecanix]

al is cheap AF :P
better to screw that up than A2

haha true. To clarify my comment I would have done that rough fitting test with a cheap'er composite, wax or hell.. an old piece of wood maybe
ps. please never tell my wife where are her ikea candles, she'll destroy me. She still wonders where they are

[ihavenofish]

you must work at one of the spindle factories ive talked to.....

[Mecanix]

ah. Nah at our spindle factory we use A4 size sheet of paper rolled between our fingers to dbl-check tapper angles. The sign-off engineers prefer that entertainment over having to click those 4 buttons out of that Microsoft Scientific calculator.

[Azalin]

Hi,

atan(7/24) makes 16.2602047083 degrees so half of the angle is 8.13010235416. So my angle will be 188.13010235416

I hope I'm good this time. Can you please confirm?

By the way, I don't know if I could directly enter "arctan(7/24)" to the angle text field in SolidWorks. I'll give it a try.

[Mecanix]

Getting the same at my end, measured from centerline mind you. Both 3.5/12 & 7/24 checks out...
If your CAD can't do math and arithmetic/operators it is not a CAD, its a scam
Bet SW can do formulas better than most others anyway... you should be more than okay on that side

[Azalin]

Thanks

[Azalin]

Hi again,

7/24 doesn't fit. There is still space in the small end of the taper. However I tried 8° 17' 50" and it appears to be the correct angle.

[ihavenofish]

O_o
whats that in decimal?

curious why it wouldn't match up. I was certain all those tapers were the same spec.

[Mecanix]

whats that in decimal?.

8.2972°

[ihavenofish]

thats 7 in 24.....

why cant kids math these days?