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| John Swift:
Hi John , they had both types B9A base coils was for transistor circuits , OC44 , OC45 , AF116 etc early mullard transistors use the same number system used on their valves ( O = no heater , C = triode ) octal base coils for valve circuits , but usefull for fets as well it all comes flooding back |
| John Swift:
Hi Kwackers and Craynerd , thanks for the web links the info is very usefull with refrence to testing speed controller boards the FC250 board looks like a cut down version of the FC350 board on the mini-millers I will post the FC250 circuit i have traced from the pcb , if some one needs it ( 240v version ) with blown fuses and a dead controller , try the simple tests I have used on a mini-lathe speed control |
| Rob.Wilson:
Hi Mad Jack Did you fined a driver for your R/T project ,,,,,,,,,,,,,,,,,,,, fitting a stepper to a shaper is a good mix old and new :med: :thumbup: Rob |
| John Stevenson:
Yabut fitting two steppers to a shaper is real cool. You fit one to the bed travel, call that X, and one to a rotary table mounted vertically, call that A. Now stick a 40 degree or 29 degree vee shaped tool in the holder and a disk in the rotab. Every time the tool retracts you move X and A at the same time, result is you now have one tooth of a spur gear that has been generated into a perfect involute. One 50 pence tool, easily made and sharpened will cut any size gear in that range. John S. |
| Rob.Wilson:
--- Quote from: John Stevenson on August 01, 2010, 05:20:20 AM ---Yabut fitting two steppers to a shaper is real cool. You fit one to the bed travel, call that X, and one to a rotary table mounted vertically, call that A. Now stick a 40 degree or 29 degree vee shaped tool in the holder and a disk in the rotab. Every time the tool retracts you move X and A at the same time, result is you now have one tooth of a spur gear that has been generated into a perfect involute. One 50 pence tool, easily made and sharpened will cut any size gear in that range. John S. --- End quote --- :med: :med: :med: :med: :smart: :smart: :smart: now there's at thought John :dremel: Rob |
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