Reducing Depth of Bronze-Backed Bushes

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Reducing Depth of Bronze-Backed Bushes

This topic has 15 replies, 8 voices, and was last updated 19 January 2024 at 18:27 by Dr_GMJN.

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14 January 2024 at 16:00 #707072
Dr_GMJN
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@dr_gmjn
All, I need to replace the bushes in my electric gate openers. The originals have been in place for about 15 years, and are completely worn out. The latest version of the openers don’t use bushes any more, so I can’t get them from the manufacturer. The only ones I could source are 15mm deep, but the plate they will be fitted to is only 10 mm thick. They are for a 20 mm diameter spigot:

What is the best way to remove the excess 5 mm height?

I thought of clamping them around a 20 mm diameter bar with a small Jubilee clip, and then turning them to length in the lathe.

Thanks.
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14 January 2024 at 16:33 #707084
mark costello 1
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@markcostello1
Light cuts, looks good from here.
14 January 2024 at 17:17 #707094
David Jupp
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@davidjupp51506
Or https://www.bearingboys.co.uk/BX-Type-Bearings/MB2010BX-Split-Bearing-Bush-17056-p
14 January 2024 at 17:23 #707095
old mart
Participant
@oldmart
If you already have the new bushes, then fit them on the 20mm bar and simply clamp them in the lathe chuck with 6 or 7 mm sticking out. Turn off the 5mm in several passes, no jubilee clips required. BearingBoys are a very good source of anything to do with bearings, I can recommend them.
14 January 2024 at 19:04 #707120
Dr_GMJN
Participant
@dr_gmjn
Thanks both.

For the life of me I couldn’t find any 10mm deep ones. I got these from Simply Bearings. I suspeced someone would immediately find the right ones, but no big deal.

I dare say the holes in the 10mm actuator plates will be oversized by the time I’ve got rid of the corrosion, and the spigots will be worn too, so I might end up making my own anyway. Plan is to Loctite them into place and hope for the best. Thought I’d at least try to buy some and try them under the assumption that they will be better than what they are now (badly deformed and a rattle fit).

If they last another 15 years, by that time I’ll be beyond caring anyway!

Any recommendations for durable heavy-duty grease that will survive a non-sealed (and underground) application like this?
14 January 2024 at 19:15 #707121
peak4
Participant
@peak4
On 14 January 2024 at 19:04 Dr_GMJN Said:

,,,,,,,,,,,,,,,,,,,,,,

Any recommendations for durable heavy-duty grease that will survive a non-sealed (and underground) application like this?

I’ve not used it myself, but Lear Corrosion Block Grease would seem to be an obvious choice.
I do use the liquid of the same name, as well as ACP-50 to good effect.
Lots of suppliers, I only point to this one, as it has a reasonable product description

Bill
14 January 2024 at 20:00 #707129
Dr_GMJN
Participant
@dr_gmjn
On 14 January 2024 at 19:15 peak4 Said:

On 14 January 2024 at 19:04 Dr_GMJN Said:

,,,,,,,,,,,,,,,,,,,,,,

Any recommendations for durable heavy-duty grease that will survive a non-sealed (and underground) application like this?

I’ve not used it myself, but Lear Corrosion Block Grease would seem to be an obvious choice.
I do use the liquid of the same name, as well as ACP-50 to good effect.
Lots of suppliers, I only point to this one, as it has a reasonable product description

Bill

Thanks Bill.
14 January 2024 at 20:25 #707139
noel shelley
Participant
@noelshelley55608
IF underground , wet and dirty, as your using plastic lined bushes I might be tempted to leave them dry on the basis that the grease will hold the abrasives as grinding paste – it was a common dilema with agricultural machines, combines etc ! It may be a good lube but what about the grit ? Noel.
14 January 2024 at 23:39 #707180
Ady1
Participant
@ady1
Babbit? If all else fails.
15 January 2024 at 13:03 #707287
Dr_GMJN
Participant
@dr_gmjn
Thanks all.

The mechsnisms are towards the top of galvanised boxes set into concrete in the ground. The boxes have drains for any water that might get into the cover plates. They are not immersed in water, but are damp. They are also not really subject to debris or dirt, but the environment within the boxes is pretty “grubby”. I think grease is essential, and I don’t think it would get too contaminated. After all, that have been working ok for 15 years; some wear is inevitable.
15 January 2024 at 13:25 #707288
noel shelley
Participant
@noelshelley55608
If possible drill a hole on the cover plate and fit an angled, 90* or 45* grease nipple into the boss and drill through the bush so you can easily regrease . This will keep the bushes clean. Remember to make the hole big enough to be able to move the gun chuck to one side to get it off the nipple also a grommet to fill the hole afterwards ! Noel.
15 January 2024 at 20:06 #707402
Dr_GMJN
Participant
@dr_gmjn
That’s a good idea Noel. I did fit some to the upper bearings when I installed the gates. I might fit some to the lower bearing casing too. I won’t need to drill the cover – it’s only secured by 6 screws and is very easy to remove.

Thanks.
15 January 2024 at 22:45 #707447
Howard Lewis
Participant
@howardlewis46836
Probably a good use for grease is act as a low friction seal to exclude water, so ensure that the grease exudes from both ends of the bush, so don’t use too viscous a grease

Howard
19 January 2024 at 08:16 #708386
Dr_GMJN
Participant
@dr_gmjn
On 14 January 2024 at 20:00 Dr_GMJN Said:

On 14 January 2024 at 19:15 peak4 Said:

On 14 January 2024 at 19:04 Dr_GMJN Said:

,,,,,,,,,,,,,,,,,,,,,,

Any recommendations for durable heavy-duty grease that will survive a non-sealed (and underground) application like this?

I’ve not used it myself, but Lear Corrosion Block Grease would seem to be an obvious choice.
I do use the liquid of the same name, as well as ACP-50 to good effect.
Lots of suppliers, I only point to this one, as it has a reasonable product description

Bill

Thanks Bill.

I looked elsewhere online, and some descriptions of the corrosion block grease say it’s a low viscosity liquid that penetrates and stops corrosion. Others say it’s high viscosity, suitable for high pressure applications.

Anyone any experience of what it actually is, and whether it’s a lubricating grease, or a water dispersant grease?
19 January 2024 at 12:30 #708456
peak4
Participant
@peak4
I looked elsewhere online, and some descriptions of the corrosion block grease say it’s a low viscosity liquid that penetrates and stops corrosion. Others say it’s high viscosity, suitable for high pressure applications.

Anyone any experience of what it actually is, and whether it’s a lubricating grease, or a water dispersant grease?

There’s two separate products, but some folks writing web sites seem to cut and paste the wrong bits into the wrong product descriptions.
ACF-50 & “Corrosion Block” fluids are similar, water dispersant and future corrosion preventatives, with the latter being higher viscosity, but I assume using the same active ingredients.

Corrosion Block grease also seems to use the same active ingredient, but in a waterproof grease base.
I’ve only used the two fluids personally.

Here’s the manufacturers page regarding the grease

Corrosion Block Grease is designed to provide maximum protection under severe conditions. Its formulation provides both high and low temperature performance, increasing the service life of critical components. Corrosion Block Grease strongly resists water wash out and provides superior protection against rust and corrosion.

Corrosion Block Grease out performs lithium and most synthetic greases and meets or exceeds requirements for NLGI Service Classification GC-LB (automotive wheel bearing and chassis lubricants), which is based on ASTM D4950 performance requirements.

Bill
19 January 2024 at 18:27 #708505
Dr_GMJN
Participant
@dr_gmjn
Thanks Bill, that explains it.
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