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[hopeitfloats]

on to mk 2 gearbox for my next build and  i am going to run the belt drive shafts on ball bearings. any thoughts on if solder would be sufficient to attach the bearing housings to the mounting plate or would silver solder be a better option.  your thoughts appreciated.                                                    craig

[nhp651]

there is no real strength in soft solder and even with low vibration I think the joint might disintegrate.
On the other hand, the temperature to silver solder, and therefor the posibility of distorting the object might also be a possibility, unless you use low melt silver solder.
However I could be wrong.
neil.

[Colin Bishop]

Thinking laterally, is it worth considering embedding the bearings in a stout plywood plate using 24hr Araldite and then bolting that to the main mounting plate with slightly oversize holes to give some adjustment? If you make the bearing housing a tight fit in the ply then it will be well supported even without the adhesive to hold it in place.

As Neil says, soft solder is unlikely to be up to the job and silver solder may need too much heat. Also - are the bearing ouses stainless steel? If so that is not easy to solder.

Colin

[hopeitfloats]

thanks for your thoughts colin and neil. i would prefer going brass plate to brass housing but cracking solder was my main concern. distorting plate with silver solder was why i hoped to be able to use soft solder.  threading and screwing housing was/is an option i may have to look at as a last resort.

[tigertiger]

Dumb question, and I don't know what I am talking about.

Would Araldite Metal repair do it?

[Colin Bishop]

TT, Chemical metal would theoretically do the job but there would have to be a very good surface to surface contact and I do wonder if it would stand up to the vibration. I have found the Devcon metal filled epoxy to be particularly good but haven't used it for this sort of purpose.

Colin

[JayDee]

Hello,
Silver soldering will soften the metal of the bearings, they will then wear out VERY quickly !!!.
Even if the bearing case is Stainless Steel, the bearing balls are high carbon steel, which will soften.
John.

[derekwarner]

Craig...as an alternate to  .. I chose to have brass ball bearing housings manufactured to contain the 3/16"  SR3ZZ stainless ball bearings & which naturally will be secured with Loctite.....Derek

[Bunkerbarge]

If at all possible is there an option of drilling and tapping and fitting brass set screws?  or possibly clearance holes and using a screw with a nut on the back.  If in doubt I always like to use mechanical means of holding things together.

[hopeitfloats]

wow. those are brilliant bearing housings derekwarner. mine wont be quite that flash.  i will be soldering?  the housings so the bearings can be fitted later with mechanical attachment still being an option if needed

[derekwarner]

Guys....there are always other options........my first install for PS Decoy  were "Sinterlite" bronze bushes [3/16" ID x 5/16" OD] & these were secured with Loctite into 5/16" ID tube sections.......you know the K&S variety from the hobby shop

At the same time I was using 3/16" [0.1875"] precision brass rod as the paddle shaft ...so things progressed as I was not happy with brass running in sintered bronze bushes .....

So Craig .....please reconsider     any thougt of soldering anything to a steel ball race outer ring as it is fundementally flawed 

In terms of other [shaft] fixing methods as mentioned by ....Bunkerbarge....the DU-BRO range of model accessories from your local hobby shop is always a good option......  Derek

[tigertiger]

I have just seen this on RC Groups forum. It may be a solution if you want to make a custom mount.

They do customised machine parts on-line.
You chuck in your design and get an instant quote.

Worth a look.
http://www.emachineshop.com/