MadModder

Gallery, Projects and General => How do I?? => Topic started by: paulmo101 on June 03, 2017, 12:51:41 PM

Title: Best adhesive to stick a magnet to a shaft - tacho project
Post by: paulmo101 on June 03, 2017, 12:51:41 PM

Hi
Still gathering information for my tacho project and I`m wondering what is the best adhesive to stick the magnet (trigger) to a shaft?  The shaft will be in the headstock of my lathe so I wouldn`t want the magnet to come adrift when the lathe is turning I was considering 2 part epoxy, bearing retainer, chemical metal any other suggestions welcome.  I was also going to cover the magnet with a strong (gorilla tape) duck type tape wrapped around the shaft and back onto its self as a belt and braces approach.
Thanks for reading

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: Ed ke6bnl on June 03, 2017, 01:02:56 PM

Bill Smith IC-2000 might be a good choice

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: paulmo101 on June 03, 2017, 01:45:59 PM

Hi Ed
thanks for the reply - never heard of it but I will have a google

Cheers

Paul

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: seadog on June 03, 2017, 02:23:52 PM

I just popped mine on the shaft letting physics do the holding, I've not had a problem and have run it above 2000rpm.

It depends on the diameter of the shaft. At a guess it's it's around 2-1/4" on my Boxford.

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: nrml on June 03, 2017, 04:39:11 PM

3M VHB tape is what I would use. You can always apply a broad elastic band on top as belt and braces. A condom with the end cut off applied over the shaft and magnet (no pun intended) several times would do the job. 

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: Charles on June 03, 2017, 05:04:28 PM

Permabond have an article on the subject here http://www.permabond.com/2015/12/06/magnet-bonding-adhesives/

There adhesives can be purchased from glueonline.co.uk - no connection to either company

The taco magnet on the shift of my mill is just stuck on with magnetism, has been OK up to 1800rpm

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: Ed ke6bnl on June 03, 2017, 05:31:37 PM

Quote from: seadog on June 03, 2017, 02:23:52 PM

I just popped mine on the shaft letting physics do the holding, I've not had a problem and have run it above 2000rpm.

It depends on the diameter of the shaft. At a guess it's it's around 2-1/4" on my Boxford.

I have not used adhesive on my neo magnets BUT mine are on a flange on the outter side of the spidle AND max rpm is maybe 800 rpm.
But this adhesive just saved me when a tube blew on my front tractor tire, I patched the tube mounted the tire and the tube leaked at the stem, removed the air put the ic-2000 on the crack and accelerator no leek and will fix later. Stronger than super glue types but high build up and some flexibility. AMAZON about $9/oz. ic-2000 rubber-toughened 1oz ca adhesive glue

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: chipenter on June 04, 2017, 03:17:25 AM

I think it depends on the size of the magnet mine is small 6mm X 1.5mm , no adesive used it hase stayed on for over two years .

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: paulmo101 on June 04, 2017, 02:04:16 PM

Thanks for the great replies - plenty of good ideas.
Will probably upgrade the magnet that they supply with a neodymium magnet so mybe okay on its own or just with tape over

Thanks Again for the replies

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: Biggles on June 11, 2017, 02:16:24 AM

Hi Paul, Mick did a something simular to his Harrison lathe. Project  Harrison L5 rescue.  http://madmodder.net/index.php/topic,7321.200.html

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: paulmo101 on June 11, 2017, 11:41:02 AM

thanks for link project looks great

Title: Re: Best adhesive to stick a magnet to a shaft - tacho project
Post by: Biggles on June 13, 2017, 10:01:59 AM

Glad to be of some help.  :thumbup: