ID Spline .dxf File 3

[nwtedm]

Can anyone make me a .dxf file for this spline?
# of teeth 20
Diametral Pitch 8.0
Preasure angle 20.0
Pitch dia. 2.5"
Base dia. 2.3492
minor Dia. 2.375
Form Dia. 2.8812

 

[dimjim]

What tolerance field do you need?
What do you plan on using the dxf
file for?

 

[nwtedm]

Backlash Min/Max .005/.008

 

[nwtedm]

Sorry
I will be wire edming the spline in the id of a hub

 

[dimjim]

What kind of spline has that kind of form diameter?
Looks strange. I would expect something in the
2.65 range. That even looks large for a major dia.

 

[nwtedm]

the print just says


INT. Involute Spline Data.
We have edmed these before but a little bigger. The customer for some reason can't get a .dxf of the tooth profile. We have a gear software but nothing for drawing a spline like this.

 

[dimjim]

Treat it like an internal gear except use .50/Dp for the
addendum and .5625/Dp for the dedendum. If you can
draw an external gear simply reverse the above addendum
and dedendums and enter the tooth space instead of the tooth thickness.

 

[gearcutter]

I could supply you with the DXF you require but it appears that the information you've supplied is incorrect.
As dimjim suggests, the form dia is way too large as is the major diam. I thought that maybe, seeing as how it's 20 deg PA, that perhaps they were using a full depth 8DP profile but even this falls well short of the diameters quoted.
For this to work out right I'd also need either the tooth space width & tolerance or the dimension between a given set of pins and also if you require either flat or fillet root.
You can contact me via this link:

http://www.aussieweb.com.au/email.aspx?id=1194181

 

[WinstonH]

Only 0.003" rad possible beyond given form dia, drawn with 0.19935"CSW. With mate equall to .006" B/Lash.?? Any additional data?

How do I post a File? eg, a (.dxf)?

Cheers WH.

 

[gearcutter]

I apologise, the data you posted is correct. From the data you sent me below; It is a full depth gear tooth form with a -0.50 addendum correction. I'll email you the dxf.

number of teeth 20
diametral pitch 8
preasure angle 20
whole depth constant (ref) 2.25
operating pitch diameter 2.5
generating pitch diameter 2.5
base diameter 2.3492
minor diameter (min) 2.375
form diameter 2.8812
root diameter (ref) 2.9464
tool tip radius .0626
AGMA quality 2000-B88
quality datum surface A-B
trans. cir TT on gen. Dia. .1469/.1484
Size between .240 pins 2.228/2.2326

 

[gearcutter]

Here is another graphic showing the int form diam. As you can see the tip of the standard mating part will just fit without non involute contact.