The Shop > Electronics & IC Programing
getting started with electronics
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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