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TO-3 Drilling Jig
TO-3 Drilling Jig
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Old 16th February 2005, 09:06 PM   #11
acenovelty is offline acenovelty  United States
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Yes, please, please.
Will want to drill holes for the KSA50 clone soon.

Prosit
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Old 11th January 2014, 12:10 PM   #12
Wildwater is offline Wildwater  United Kingdom
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This is a sleeping thread, I know, but a TO-3 drilling Jig would certainly be an answer to my need and I have searched both this site and the wider internet at length without finding anything more practical.

I will soon need to mount 12 x TO-3 cases onto thick T section aluminium which will be the thermal link to my heat sinks. I do have a few old transistors that I could sacrifice and use as templates (with a friend to say if I am keeping my hand held drill upright) but before I do that I wondered how others did it.

Please could you share any hints or tips.
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Old 11th January 2014, 12:11 PM   #13
KatieandDad is offline KatieandDad  United Kingdom
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I'd buy a cheapie 2N3055 and pull it to bits.
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Old 11th January 2014, 02:05 PM   #14
franzm is offline franzm
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Use a PCB routing software to make a drilling template.
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Old 11th January 2014, 02:44 PM   #15
levistubby is offline levistubby  United Kingdom
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Having a template for a single device is not always a great help. It depends on whether it can easily be clamped to the heat sink while it is being used. In a lot of cases it is easier to draw the layout for all the devices on paper, then lightly stick the paper to the heat sink, centre punch the position of all the holes through the paper, remove the paper and drill the holes.
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Old 11th January 2014, 02:48 PM   #16
frank1 is offline frank1  United Kingdom
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Use a TO3 mica washer to mark out then centre punch.
Nothing else needed.

Frank
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Old 11th January 2014, 02:50 PM   #17
AndrewT is offline AndrewT  Scotland
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Manufacture a steel drilling jig with the 4 holes in the correct position.
If need be, pay a machinist to drill your jig accurately. It would not cost much extra to get two sets of 4 holes in the one jig.
I'd suggest at least 6mm thick and preferably approaching 12mm thick.
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Old 11th January 2014, 04:33 PM   #18
Wildwater is offline Wildwater  United Kingdom
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KatieandDad - That was, indeed, my thought and I donít need to buy anything as I have some RCA 2N3235s that have sat in my oddments drawer for a few decades. Though on googling them I see someone recently sold them at GBP3 each so perhaps I should rename it my treasure chest

franzm, levistubby and frank1 - I guess you are right I should be braver especially as I donít even want to insulate the transistors from the T piece so I only need to make sure the pins donít contact the ďintermediate aluminiumĒ.

AndrewT - If I donít get braver Iíll try to find a light engineering shop and every data sheet has the measurements on it!

Thanks to all for this food for thought.
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