Electronics Forum | Wed Aug 25 19:10:40 EDT 2004 | jsloot
Can anyone tell me what a reasonable real world percentage would be for tact time on SMT machines. If I have a machine rated at 14,400CPH what would be real world, 85%, 75%? Thanks
Electronics Forum | Thu Sep 09 02:48:23 EDT 2004 | fastek
Peter- If you have all of these machines in your factory, why are you asking what their throughput and tact time speeds are? You should know better than anyone.
Electronics Forum | Thu Aug 26 13:51:57 EDT 2004 | Dreamsniper
I've done a few capacity and capability studies and bought new SMT equipment (Pick and Place) based on the above required capacity. I did not rely on equipment manufacturer's tact time. I used only 60% of their tact time as achievable in real manufac
Electronics Forum | Thu Aug 26 12:06:53 EDT 2004 | loz
I think realistically any speed quoted by any manufacturer should be down graded to 80% of what they quote. This should be used as top end, then the component, feeder count and complexity will start digging into this. As for achieving 75% of book spe
Electronics Forum | Wed Sep 08 07:06:36 EDT 2004 | peter016
Hi Rob, Thanks for the reply. Our boards are 4 ~ 6 ups and mostly double sided. The ratio between chips and IC/Odd shape varied from products to products. So, line balancing between chipmounter and GSM is tough to do. Some boards are mirror image to
Electronics Forum | Wed Sep 08 12:36:10 EDT 2004 | Rob
Hi Peter, I've got to admit we cheated by adding another GSM per line, but that's not always the most economical option. Cheers, Rob.
Electronics Forum | Thu Sep 09 22:13:40 EDT 2004 | peter016
Hi Fastek, Why am I asking ? Cost pressure ! Down 10~15% every year to remain competitive. Need to do differently for better $ per unit. Hi Rob, Thanks for your candid advice. Kind Regards, Peter
Electronics Forum | Wed Sep 08 03:08:05 EDT 2004 | peter016
Hi Everyone, I am new to this forum. I have posted a similar question on this subject (Chipmounter Plancement Speed). Does the 60% inclusive of the PM and Downtime ? I also find that line balancing also plays a part. For example the Universal GSM II
Electronics Forum | Wed Sep 08 20:48:36 EDT 2004 | peter016
Hi Rob, I guess the ratio between chipmounter and GSM is very much depending on the chip to ICs ratio. This is product dependent. We use 2 HS50 to 2 GSMII, 5 S20 to 2 GSMII, 3 Sanyos to 2 GSMII, and 2 CP6 to 2 GSMII. Are these ideal ratios ? Lean Ma
Electronics Forum | Wed Aug 25 19:35:48 EDT 2004 | russ
This is highly dependent upon your board, vision inspection, part rotation, part type, layout, number of P/Ns per (1 pers or 100 pers) feeder layout, optimization, nozzle changes, etc... all have significant impact on placement speed. I find if you
