Maggie’s The Welding and Metalworking Thread

lariat · Tuesday at 4:11 PM

Calling all guys who run CNC machines, I need some advice: I need to re-caulk some joints inside my mills as the coolant has eaten up what is in there. I have used RTV and a number of different sealants over the years. It will last about a year and then degrades to failure. Im currently using Percool 5440 as coolant.

Any advice will be greatly appreciated.

Makinchips208 · Tuesday at 4:19 PM

lariat said:
Calling all guys who run CNC machines, I need some advice: I need to re-caulk some joints inside my mills as the coolant has eaten up what is in there. I have used RTV and a number of different sealants over the years. It will last about a year and then degrades to failure. Im currently using Percool 5440 as coolant.

Any advice will be greatly appreciated.

Oil based coolant or water?

One idea is Sikaflex, building supply store should have it.

Or else the black urethane stuff that they glue windshields in with. Auto parts store should have it.

lariat · Tuesday at 4:20 PM

Makinchips208 said:
Oil based coolant or water?

Oil, semi-synthetic.

Makinchips208 · Tuesday at 4:33 PM

lariat said:
Oil, semi-synthetic.

Another we use when reassembling machines that use straight synthetic oil coolant is Stucarit 309.
Or sometimes called Dicht Gel.

But that’s more for a layer between two parts, like a non hardening gasket.

There was a German brand of caulk also but I’ll have to send an email to try and figure out what it was.

RPN · Tuesday at 11:54 PM

We use Sikaflex 11FC for that, it works well.

It also sticks like shit to a blanket, so wear gloves or stand by for a major scrub session afterwards. It's called Satans snot for good reason in the workshop.

ZiaHunter · Wednesday at 10:29 PM

Needed a spider for my SBL 10L so made this the other day.

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