Re: [mfg-smartcam] Ridgid tapping

[Bob Looney]

I am currently roll form tapping 1/4-28 in 1/4" A36 plate, 3920 rpm at 140 ipm. 96 holes every 4 minutes, all day long. also rigid peck tapping 4 sheets of 6061, .187 thick, stacked at the same speed/feed, .65 peck depth.   bob ----- Original Message ----- From: Jeff To: rm ; Smartcam User Group Sent: Saturday, November 02, 2002 6:51 PM Subject: Re: [mfg-smartcam] Ridgid tapping   ... 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     Yes, All day long.   Cut taps up to 7/8"-14 we run 110 - 140 sfm in aluminum. Larger rollform taps we run 100 - 120 sfm and the smaller rollform taps around 75 - 90 sfm. We also use rollform taps in cast durabar at around 40 - 50 sfm with no problem.   Anything above 7/8"-14 we thread mill with Schmarjie 1/2" dia. x 4-flute solid carbide at 1200 sfm and 60 ipm.   Jeff