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Securing a pulley

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Securing a pulley Empty Securing a pulley

Post by Robotstar5 on Sun Mar 31 2019, 20:36

I probably lead a sheltered life as I've only seen pulleys secured with keys or taperlocks, I have one for the A1 that has 2 holes, one through the face and the other at 45° through the boss, both end in a groove in the centre of the hole, not sure if either of the holes is tapped yet.

The hole through the face (good job I didn't chuck my old pistol cleaning kit, it worked a treat on the holes Very Happy )

Securing a pulley Petter66


The hole through the boss

Securing a pulley Petter67


The groove inside

Securing a pulley Petter68

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Post by Villiers on Sun Mar 31 2019, 22:24

Like I said on faceache it's probably a loose pulley used as a drive pulley, if you are that worried there's plenty of pulleys on ebay that will fit, 1 1/2 inch shaft, same as a Lister D
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Post by chiefy on Tue Apr 02 2019, 09:16

The hole through the face would most likely be the one that would be tapped the hole at a angle through the boss could be a oil hole for a free running pulley if you have taps just tap the hole in the face.
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Post by Robotstar5 on Tue Apr 02 2019, 15:34

Measuring the hole looks like it would be ¼" BSF so I've got to find a long series tap to try as all mine are too short, although ¼" BSF grubscrews seem a bit scarce so I might be going Metric as it's hidden, but don't tell anyone Very Happy

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Post by chiefy on Wed Apr 03 2019, 09:20

Like you say it may be that you go down the metric route and 6 mm is the nearest to 1/4" B S F a man on galloping horse will never notice the difference in thread form,you can if you want drill the hole out to a bigger diameter say two thirds deep to accommodate the tap holder then tap the bottom bit.
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Post by Woodsman on Wed Apr 03 2019, 15:00

Grubscrews ? - try here

https://www.ba-bolts.co.uk/index.html

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Post by Robotstar5 on Thu Apr 04 2019, 03:47

So would it be good engineering practice to drive the load through the grubscrew?, I was just thinking of the shearing force on the threaded portion.

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Post by chiefy on Thu Apr 04 2019, 12:54

Lots of pulleys were driven by a screw only, excepting where they fastened onto the shaft a flat was filed on the shaft for the screw to fasten onto,with modern allen keyed grub screws they are designed to screw down straight on to the shaft and they bite into the shaft they are high tensile,this can present a problem when you want to remove the pulley because of the burrs they raise , so its back to a small flat on the shaft.
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Post by Robotstar5 on Thu Apr 04 2019, 15:26

chiefy wrote:Lots of pulleys were driven by a screw only, excepting where they fastened onto the shaft a flat was filed on the shaft for the screw to fasten onto,with modern allen keyed grub screws they are designed to screw down straight on to the shaft and they bite into the shaft they are high tensile,this can present a problem when you want to remove the pulley because of the burrs they raise , so its back to a small flat on the shaft.
Rgards,
Chiefy.

Excellent, thanks for the explanation, although I consider myself fairly practical I don't have an engineering background (sparky by trade) so I normally leave that stuff to the fitters at work Very Happy

Slight drift OT but I have noticed craft/trade apprentices are not given the skills that were taught to the previous generation, maybe it's because modern equipment is built to higher tolerances, but lower cost with less serviceable parts so the skills such as bearing scraping are no longer needed (or taught). I've noticed the same in my own trade, in the 70's, contactors (big relays!) could be overhauled with manufacturer supplied service kits of new contacts, springs etc., but modern ones are not designed to be dismantled, just dumped and replaced with a complete new unit.

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Post by Robotstar5 on Thu Apr 04 2019, 15:28

Woodsman wrote:Grubscrews ? - try here

https://www.ba-bolts.co.uk/index.html

Thanks for the link, looks like the Petter will be staying Imperial and I will find a use for the Imperial Allen keys Very Happy

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Post by chiefy on Tue Apr 09 2019, 09:14

Good looks like a successful outcome and i agree that modern day apprentices are not taught all the old skills i think that modern day thinking is if you have a problem with any kit chuck it away and buy another!!!.
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