Model D1 - Flywheel destroyed magnet

[metavox]

hi.
can someone help me?
my magnet on the flywheel on my model D1 rower its in pieces. it is possible to change it to some other magnets? or i need to buy the complete flywheel?
regards, Paulo

[mict450]

Hi Paulo, welcome to the forum. It would be best if you contacted the C2 vendor in your country, as they would be able to advise you best. Offhand, I would say you would have to purchase the complete flywheel but I could be very wrong.

[Carl Watts]

Hi Paulo,

Yes its possible but it would be a bit of work.

There are effectively 12 magnets in that magnetic ring in alternating north and south orientation.

You would need some neodymium disk magnets no thicker than the ring or they will hit the tach pickup. You could get away with using some quality superglue on a clean flywheel surface. The diameter of the magnets would be the same as the width of the ring.

Alternatively you could drill the pattern required in the flywheel but you would need to do it very accurately and probably use smaller diameter to leave enough metal in the "Spokes" after drilling so the whole flywheel doesn't sheer off, but longer magnets and Loctite them into the holes.

Essentially your whole flywheel is now stuffed anyway so you have nothing to loose by trying to repair it.

Sounds like your possibly in Brazil so getting parts right now could be hard for you.

[iain]

Hi Paulo,

Yes its possible but it would be a bit of work.

There are effectively 12 magnets in that magnetic ring in alternating north and south orientation.

You would need some neodymium disk magnets no thicker than the ring or they will hit the tach pickup. You could get away with using some quality superglue on a clean flywheel surface. The diameter of the magnets would be the same as the width of the ring.

Alternatively you could drill the pattern required in the flywheel but you would need to do it very accurately and probably use smaller diameter to leave enough metal in the "Spokes" after drilling so the whole flywheel doesn't sheer off, but longer magnets and Loctite them into the holes.

Essentially your whole flywheel is now stuffed anyway so you have nothing to loose by trying to repair it.

Sounds like your possibly in Brazil so getting parts right now could be hard for you.

No idea how easy this would be, but while it would give you a machine to train on, this is likely to throw off the moment of inertia and therefore the calibration of the machine so times would no longer be directly comparable.

[Carl Watts]

Its not going to make a whole lot of difference, the magnets are to close to the center to change the inertia.

By the time you factor in the weight difference between a continuous ring and individual magnets its not worth worrying about. Probably more difference in a flywheel covered in dust. I have seen them smothered in dust all over the leading edges of the fan blades.

That ring magnet is not that powerful, you could probably just run smaller disk magnets like small pucks. Don't need much glue either, they naturally stick to the steel by themselves.

You could test that it works before you even glue them on.