single start worms 1

[mfgenggear]

Hi

looking for a single start Diametral Pitch worm calculation from measurement over three wires to circular tooth thickness.
& from circular tooth thickness to measurement over three wires.

Heres the data if some one can give an assit.

# of starts~1
DP normal~32
PA normal~20 deg.
lead Angle~ 2 deg 23' 30" RH
axial pitch~ .09826
Pitch Diameter~.749
root diameter~.680-.660
lead~.09826
wire dia~.054
Measurement over wires .826-.824

Thanks

Mfgenggear

 

[mfgenggear]

using my gear program I calc .0488 normal ctt.
I would like a second check.

mfgenggear

 

[gearcutter]

This is what I get.......pretty close to your result.
Dimensions are metric.

Reference profile 1.25 x 0.38 x 1.0 ISO 53.2 Profile A

Addendum coefficient 1.000
Dedendum coefficient 1.250
Generating angle 20.000°
Normal Pressure Angle 20.000°
Helix angle at reference diameter 87.611°
Lead angle at reference diameter 2.389°
Reference diameter 19.025
Tip diameter 20.612
Tip form diameter 20.612
Root diameter 17.040
Generating Profile shift coefficient 0.0000 - 0.0000
Manufactured root diameter 17.040 - 16.982
Normal tooth thickness 0.000 - -0.021
Theoretical pin diameter 1.326
Actual pin diameter 1.372
Diameter at contact point 19.112
Chordal tooth thickness at pitch diameter 1.246
Actual chordal tooth thickness 1.246 - 1.224
Axial Tooth Thichness 1.247
Actual tooth thickness 1.247 - 1.226
Reference chordal height 0.791


Ron Volmershausen
Brunkerville Engineering
Newcastle Australia

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

 

[mfgenggear]

Gear Cutter

Than you for your response.

My calculation above was nominal.
my high & low CTT is as follows.
.0491/.0483 which rounded off.

Thanks & Take Care

Mfgenggear