Motor mount holes and steering servos

[carparkthrasher]

Hi all,

Whilst risking breaking the rule that 'there is no such thing as a silly question' but.......................... here are two efforts!

1) - have found this weekend that my recently built Hotshot blasted round the garden and field quite happy for some twenty minutes before all of a sudden the high pitch whizz of a spinning motor not making contact to any drive gear greeted me. Pinion gear and drive gear no longer meshing. No problem thinks I, I must have used the wrong holes when mounting the motor - FYI, motor is a LRP unit 19x2 (also the following comment applies to the Orion motors I also use). This is the bit I can't understand - the standard silver can has 2 or 3 holes with the two being at exactly half way round the can and in line with each other, only those holes exist so you cant really get it wrong. On the modified motors however they all seem to have four holes with each pair on either side of the centre point. Now I have spent so long staring at these that my eyes have gone but - should one pair of holes work exactly as the stock can, i.e. dead in line and mounting as the stock would with the other pair allowing the pinion gear to be closer or further away to the drive gear?

If so, how do you figure out which is which? Only I have tried all the combinations I can think of - top screw in hole A with bottom in A, top in B with bottom in A (as it seems to reach?) and nothing gets it to mesh with the drive gear properly. The drive gear seems intact with no teeth missing and a 20 minute run should hardly have worn edges down and the pinion gear is on tight. I haven't stripped the car yet to be 100% sure of what is going on but am convinced it is something to do with the motor mount. Any thoughts what else I can try at this stage before disassembly?

2) - Is it just me or when building a new kit - 'ensuring servo is in neutral, attach the relevant steering components and according to the diagram everything will be lovely and straight. Using standard Acoms servos I have never, never had one gone on perfectly with the steering trim in neutral and have it give me a straight line for the steering, it is always off. Just had to share that one really..............

right, best get back to work................

CPT

[TWINSET]

I've always assumed that 'non-silvercan' motors have a spare set of holes in case you wreck one set, and that the 'pair' are diametrically opposite (top left and bottom right etc.)

[VagabondStarJXF]

I use Acoms servos aswell and have the same result. That being said I've used a lot of different brand servos and I've never had one go on without a little trim adjustment afterwards.

[carparkthrasher]

I've always assumed that 'non-silvercan' motors have a spare set of holes in case you wreck one set, and that the 'pair' are diametrically opposite (top left and bottom right etc.)

As ever Twinset, you have a great diagram to explain the issue! On this basis, if using the pairs correctly leads to the issue then I guess I am left looking at stripped gears?

Ta!

[TWINSET]

if using the pairs correctly leads to the issue then I guess I am left looking at stripped gears?

Possibly, but it might just be the spur gear's worn slightly, where you inadvertently used an A and B hole, and re-aligning everything could sort it out

Put a couple of pen marks on the motor can so you know you're using the right holes, or sling in a two hole 540 just to make sure the gears aren't toast.

Check you've still got all the BD6 'set plates' too - dunno how conceivable it is that you mighta lost one though?

[carparkthrasher]

Possibly, but it might just be the spur gear's worn slightly, where you inadvertently used an A and B hole, and re-aligning everything could sort it out

Put a couple of pen marks on the motor can so you know you're using the right holes, or sling in a two hole 540 just to make sure the gears aren't toast.

Check you've still got all the BD6 'set plates' too - dunno how conceivable it is that you mighta lost one though?

Man those set plates are a nuisance! All present and correct - just annoying! A regular 540 was my next test actually so I will see how I get on. I do like it when a kit allows you to remove the gearbox cover and see the gears in action or the TA01/2 with that motor mount that you fix to first that then guides you home.

[carparkthrasher]

Oh and 'diametrically opposite' - get you and your education and words and that!

[TWINSET]

Oh and 'diametrically opposite' - get you and your education and words and that!

Mater and pater realised one was never cut out for lifting heavy weights, so one learnt technical parlance as an alternative

[Kevin_Mc]

Oh and 'diametrically opposite' - get you and your education and words and that!

Mater and pater realised one was never cut out for lifting heavy weights, so one learnt technical parlance as an alternative

cheered me right up