Model Boat Mayhem - Forum

Technical, Techniques, Hints, and Tips => Detail Work, Rigging, Fittings, Figures Etc. => Topic started by: MLT44 on June 25, 2014, 09:39:45 PM

Title: Ball bearing races
Post by: MLT44 on June 25, 2014, 09:39:45 PM
Hi all out there
                    I'm trying to find if anybody knows where I can buy any small ball race bearings, for a 4m propshaft. I thinking of building a pulley drive for one of my tugs. I'm thinking of trying the dreaded brushless. {:-{
                               Dave
Title: Re: Ball bearing races
Post by: Calimero on June 25, 2014, 09:50:33 PM
"Dreaded brushless", come on ! It's not so complicated. Especially for scale boats that have very simple requirements. And you probably won't need any pulleys or gear box. Just slap the motor with the right kv and off you go !  :-))
Title: Re: Ball bearing races
Post by: derekwarner on June 25, 2014, 10:38:56 PM
Dave.....try Google for Miniature Parts & Bearings....or Small Parts & Bearings......they are a world wide group

They have Grade 304 stainless steel double shielded ball bearings pre-mounted in miniature plummer blocks for about $25.00 each

May sound expensive but considering the option if you don't have machining facility they are great.....and could be considered prototypical.....

Here is an image of the exact items.......Derek
Title: Re: Ball bearing races
Post by: Danny on June 25, 2014, 10:52:56 PM
Try
http://www.derbybearings.co.uk/ (http://www.derbybearings.co.uk/)
never used them but heard they were ok - they have no minimum order.
One I have used and are very good is
http://www.smbbearings.com/index.html (http://www.smbbearings.com/index.html)
Cheers
Title: Re: Ball bearing races
Post by: SailorGreg on June 26, 2014, 08:36:07 AM
I have used www.motionco.co.uk (http://www.motionco.co.uk) and been very happy. 

Looks like there's lots of sources out there  :-))

Greg
Title: Re: Ball bearing races
Post by: flashtwo on June 26, 2014, 09:03:29 AM
Hi,

Try "Arc Euro Trade" of Leicester - they do a whole range of bearings and tools for the small machinist.

Ian
Title: Re: Ball bearing races
Post by: hopeitfloats on June 26, 2014, 09:20:08 AM
another couple of sources are radio control cars and fishing equipment suppliers.  RC cars and fishing reels have small ball races and they usually aren't that expensive
Title: Re: Ball bearing races
Post by: Terry on June 26, 2014, 02:19:11 PM
A bit off topic, but maybe a useful hint. Get hold of an old video recorder, the recording head is mounted on very high precision bearings which are hardly ever worn out.


Cheers, Terry
Title: Re: Ball bearing races
Post by: MLT44 on June 26, 2014, 09:37:41 PM
Hi all
       Thank you all for the info,it gives me a whole lot to think about, which way to go, I'll keep you all posted, on which way I chose to go. Once again thank you all.  :-))
Title: Re: Ball bearing races
Post by: MLT44 on September 28, 2014, 09:25:43 PM
Hi Calimero
           I was walking pass a hobby shop in a local village last mouth, in the window there was a box of motors. They were all brushless, he gave me a price for the lot. He was selling them for a widow of a modeller, so I bought them. There were three large ones, after checking them on the tinternet, one stood out from the rest. It's a AXi 28/26/12, Kv 720 12 pole, so I've fitted it to a 30" tug, she runs great, so you can see even at three score and ten we can take on new ideas.
  So thank you all for your help
                             Regards Dave  :} :-)) :-))
Title: Re: Ball bearing races
Post by: Calimero on September 28, 2014, 10:49:49 PM
Good for you !  :}

Things are a bit reversed for me: I have to try the "dreaded pulleys+belt".  {-)

I'm in the process of converting a 55" tug hull which was powered by a live steam engine by her previous owner. I'm going to upgrade the prop to a 120mm one. Shaft RPM should be around 1400. Which is pretty low for direct drive. I'll probably go with MFA 2.5:1 pulleys/belt and get a 320kv brushless outrunner under 12V.
Title: Re: Ball bearing races
Post by: dem555 on September 28, 2014, 11:57:30 PM
www.modelfixings.co.uk
Title: Re: Ball bearing races
Post by: red181 on October 25, 2014, 10:59:53 PM
I'm a bit late coming in here, MFA do gears/pulleys and belts, I use them. Just make sure you drill the pulley dead square or it will be out of balance. I change the gear ratio depending what size lake I am running on, small lake, fast acceleration, top speed not important, big lake then top speed :-))