Suffolk Punch Drive

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Bondy111 Guru Join Date: Nov 2007 Location: Gloucestershire, England Posts: 962	Suffolk Punch Drive 10/14/2009 12:40 PM
	Hi. I was wondering how could I remove the drive bit from a 1hp suffolk punch engine? It is a centrifugal drive unit - Once the engine is fast enough, the bits attached rub against the side of the drive tube, and the blades start to rotate. I cannot think how to remove it, it doesn't look like there is a screw thread to put a puller on, but it could just be gunked up with mud etc. Also, there is what looks like a pin on it, but it doesn't go all the way through, one one side you see the head of it (it looks like a pin head) and there is nothing on the other side. __________________ bondy111
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bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 7498 Good Answers: 97	#1 Re: Suffolk Punch Drive 10/15/2009 1:01 AM
	http://www.mtmc.co.uk/prodtype.asp?cookiecheck=yes&PT_ID=12731028 __________________ If death came with a warning there would be a whole lot less of it.
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Bondy111 Guru Join Date: Nov 2007 Location: Gloucestershire, England Posts: 962	#2 In reply to #1 Re: Suffolk Punch Drive 10/15/2009 1:49 AM
	Number 703 is the bit in question, but that is the one that fits into the toothed gear. __________________ bondy111
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bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 7498 Good Answers: 97	#3 In reply to #2 Re: Suffolk Punch Drive 10/15/2009 2:11 AM
	What's the problem with it? #703, 704 & 705 are parts of a mechanical bearing. It's an assembly, start with 708 and disassemble. __________________ If death came with a warning there would be a whole lot less of it.
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Bondy111 Guru Join Date: Nov 2007 Location: Gloucestershire, England Posts: 962	#4 In reply to #3 Re: Suffolk Punch Drive 10/15/2009 11:52 AM
	My one has a centrifulgal part attached to the drive shaft, not the one in this case which has a toothed gear it engages into. __________________ bondy111
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bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 7498 Good Answers: 97	#5 In reply to #4 Re: Suffolk Punch Drive 10/15/2009 4:24 PM
	Is it a clutch? __________________ If death came with a warning there would be a whole lot less of it.
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Bondy111 Guru Join Date: Nov 2007 Location: Gloucestershire, England Posts: 962	#6 In reply to #5 Re: Suffolk Punch Drive 10/16/2009 1:44 AM
	Yes. It's a centrifugal clutch - once the RPM gets high enough, it engages. __________________ bondy111
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Massey 726 Power-User Join Date: Mar 2009 Location: O'er looking the silvery Tay Posts: 255 Good Answers: 18	#7 Re: Suffolk Punch Drive 10/16/2009 6:43 AM
	Hi Bondy111, I've got an old Punch which has the centrifugal clutch that you describe. Perhaps mine is an older version because there is a square headed machine screw in the boss of the coupling which locates the assembly in relation to the chain drive sprocket. It is apparently the only linear adjustment in the drive line. Anyway enough of that, there is a woodruff key located in the crankshaft underneath the drive coupling and having dismantled mine some years ago I recall that once the 'pinch screw' was backed off a couple of turns a soft faced hammer was sufficient to persuade the half coupling to come adrift from the crankshaft. Are you sure that the 'pin' to which you refer is not in fact the stub of the sheared pinch screw? I reckon mine to be only 3/16 Whitworth and pretty vulnerable to shearing if attacked by a heavy handed wrench. The Suffolk Iron Foundry products were not prone to change over several decdes so yours may well be similar. Good luck. Massey __________________ If it ain't broke,leave it well alone .........until it comes looking for you!
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Bondy111 Guru Join Date: Nov 2007 Location: Gloucestershire, England Posts: 962	#8 In reply to #7 Re: Suffolk Punch Drive 10/16/2009 4:05 PM
	Thanks. I think I will drill it out. I have tried crowbaring it off, but it couldn't get it off. Hopefully after I drill, it will come sliding off. It has a key inside on the shaft doesn't it? i suppose if that has been dislodged it could stop it going smoothley. I will get back tomorrow. Thanks! __________________ bondy111
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bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 7498 Good Answers: 97	#9 In reply to #8 Re: Suffolk Punch Drive 10/16/2009 5:14 PM
	Not likely a woodruff key is settled into a matching concave depression so it has no where to go. May I advise treating the mating surfaces of the coupling and shaft with oil of wintergreen an let it set overnight to abate the unwillingness to move smoothly __________________ If death came with a warning there would be a whole lot less of it.
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Bondy111 (4); bwire (4); Massey 726 (1)

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