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Inner thread:
- When cutting an inner thread, the speed remains the same for an equivalent diameter,
- The gear settings are the same. Nevertheless, you need to calculate the bore diameter
and penetration depth. To do this, use the following formulas:
BORE DIAMETER FOR A THREAD OF
PENETRATION DEPTH FOR A 2.5 MM PITCH:
Tighten the part into the chuck - Bore to a diameter of 17.3 mm, Raise and rigorously
position the tool by bringing it out by twice the length to be machined, for once again
there is no footbrake available for use,
Start up the machine and place the tool at a tangent to the bore,
Disengage the tool to the right on removing it from the part, Take a 0.5 mm cutting
depth (for the first pass only), i.e. 10 divisions on the Vernier callipers, Stop the machine,
engage lever 2 (leadscrew clutch),
Lubricate the part with cutting oil,
Start up and place one hand on wheel 14 to disengage the tool (when it reaches the
desired thread length or the end of the bore, for a full length thread).
WARNING: To disengage the tool, turn the wheel clockwise for an inner
thread
The other hand remains in place on the machine stop button
114135-Manual-D-EN.indd 21
M 20 X 2,5 =
D - ( 1,08 x P ) =
20 - ( 1,08 x 2,5 ) = 17,3
0,577 X P
0,577 X 2,5 = 1,3925 to radius
© FAR GROUP EUROPE
External
thread on the
right
21/03/12 10:45:00
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