Re: [mfg-smartcam] Ridgid tapping

[rm]

Jeff... I have a question for you in reference to the tapping parameters you provided....... If you had a prototype housing with 100+ hrs in programming/setups/machining would you run the same numbers?  Would you use the roll form?  I used to run production and wouldnt hesitate to tap at recommended SFM's but now find that on very small Qty's with no overuns my sphincter tends to palpitate at just the sight of a tap turning a grand or more.  Just  curious..............rm ----- Original Message ----- From: Jeff To: Smartcam User Group Sent: Friday, October 25, 2002 9:53 PM Subject: Fw: [mfg-smartcam] Ridgid tapping Your right Mike, the calculations were off.   I'm sorry for the confusion, I copied and pasted the calculations from another size tap and forgot to edit the numbers. I hope no one tried to run the tap at that speed.   Aluminum   1/4"-20 Rollform tap   1400 RPM  70 IPM  1018 HRS                  Cut Tap         800 RPM  40 IPM   Aluminum   10-32 Rollform Tap   1600 RPM  50 IPM 1018 HRS                  Cut Tap         640 RPM  20 IPM   for a 1/4"-20 rollform I use a .228 drill (5.8 mm) and for a 5/16"-18 rollform I use a .287 drill (7.3 mm). Drilling a blind hole to 1.100 deep and tapping at 1.0 deep.   I use cut taps or thread mills for the most part and use rollform taps for the blind holes because they don't compact chips in the bottom of the hole. I've never had any problems with rigid tapping. I copied this from an existing program, the codes look like this.   Mori SH50 N790 M06 (5/16"-24 PULLEY TAP TOOL 42) N795 T54 N800 G00 X-4.75 Y-0.75 S960 M03 N805 G43 Z0.0 H42 M08 N810 M29 S960 N815 G98 G84 Z-1.0 R0.3 F40.0 N820 X-3.25 Y-0.656 N825 X-0.5 Y-1.37 N830 X-0.66 Y-4.42   Niigata PN40 N155 M106 (1/4"-20 ROLLFORM TAP TOOL 106) N160 T62 M08 N165 G00 X1.179 Y-2.269 S1400 M03 N170 G43 Z0.0 H106 N175 M109 S1400 N180 G98 G84 Z-1.0 R0.3 F70.0 N185 X2.145 N195 X2.750 Y-1.250 I'm leaving for Japan tomorrow morning so if you have other questions about tapping or thread milling I'll answer them when I get back.     Jeff Pieper EATON Hydraulics