Lubricating a glass screw thread

Nov 07, 2018 19 Replies

In the oven, the light is protected by a thick glass cover that screws off, except this time the thread seemed to have bound to the thread it screws into and it required all my strength to unscrew it.



What can I put on the thread, or do it, to prevent that happening again?



Thanks,



Daniele


Assuming it's bosch/neff, just buy the proper removal tool, it makes a

*WORLD* of difference

Mine was so firmly stuck there was the likelihood of twisting the whole assembly round. The glass had come in half quite cleanly, so i had no option but to break out the remaining glass.

Bill

Dunno about the lubrication, but three tips when removing it:

- use the Bosch removal tool. Worth every penny.

- if the tool slips, put it inside one of those disposable latex gloves

- it's easier if you remove the oven door (two latches on mine)

Luckily my oven light fails often enough that the cover doesn't get time to stick. My problem is that the bulbs are getting difficult to source in the shops.

Wrap of Teflon tape?

Thomas Prufer

That is a good point. I can't see an LED bulb lasting long in that environment.

Another side effect of the tree hugging nonsense.

Time to stock up!

I found plenty in Homebase

Something with teflon in it perhaps? Screws in things that get hot and cold are notorious. also of course I've even encountered rust in these things due to the high levels of steam and long times between cleaning or maybe because of the substances used for cleaning. Brian

The problem though with any thread moulded in two different materials is that if one is metal it can go rusty and jam it all up.

Brian

I don't think you can, but you can buy a device that fits over the glass to give you gretaer grip and turning moment. From Amazon, Then put slckening the glass in your monthly maintenance list.

Why? Incandescent bulbs will always be available for applications where there is no practical alternative.

Tim

Copaslip is used on drill pipes and works at high temperatures.

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eg eBay item number: 112730846459 (first one I found)

Cheers

Copaslip is used on drill pipes and works at high temperatures.

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eg eBay item number: 112730846459 (first one I found)

Cheers

The normal highest temperature reached in an over is around 275degC, but may be slightly higher if you are trying to clean pyrolytic linings. Teflon starts to decompose at a lower temp than that (), so it might be advisable to not use it.

FWIW, when we got our new oven three years ago (an AEG), I loosened the glass oven bulb covers by undoing them a few degrees before using it for the first time, as I had got caught by the previous oven with a failed bulb and stuck cover. I just checked, and they are still loose.

In the dim and distant past, milk of magnesia used to be used on industrial threaded fasteners. Certainly biologically safe in this environment.

Great, I have a tube waiting to be used.

Daniele

Bear in mind that it contains mineral oil

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so that at peak oven temperatures it will release some vapour and/or corrosion products.

Regular bulbs are getting (more) difficult to source in shops, because LED bulbs don't blow as often so there isn't as much demand. So while your local corner shop might have used to stock lightbulbs, they don't any more.

As usual there's plenty online.

Theo

The Natural Philosopher pretended :

One of the pound shops sells a pack of two for a pound. They (the ones I bought), were actually rated for 240v unlike some which are sold rated for 230v. I have just had to replace one of the four, after four years usage. The previous ones which only lasted weeks, were sold as for 220/240v.

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