Hallo to all,
Can anybody tell me why the motors with the High Efficiency Pack make more noises forewards than backwards.
The Tiger I/E makes alot of noise and backwards the Tiger is soundless!!!(sewinmachine)
Kind regards Gerrit.
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The High Efficiency Motion Pack and noises!
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Gerrit Keeman
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Günter Gäbelein
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Re: The High Efficiency Motion Pack and noises!
Hello Gerrit,
I have the same effect with my T34, but I haven't an answer. I am also interested in a solution to that problem.
I have the same effect with my T34, but I haven't an answer. I am also interested in a solution to that problem.
Kind regards
Günter
Günter
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leesellars
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Re: The High Efficiency Motion Pack and noises!
Hello Chaps
There is no problem with the motors or gearboxes. This is the way it has to be with these gears. I have been informed that they will quiet down after they have beded in. My solution is to turn the sound up.
Lee
There is no problem with the motors or gearboxes. This is the way it has to be with these gears. I have been informed that they will quiet down after they have beded in. My solution is to turn the sound up.
Lee
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Dont hit me so early in the morning with those negative waves.
Listen carefully i shall say this only once.
If its not broke dont fix it.
Ich Hatt Einen Kameraden
Dont hit me so early in the morning with those negative waves.
Listen carefully i shall say this only once.
If its not broke dont fix it.
Ich Hatt Einen Kameraden
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Paul Fairlamb
Re: The High Efficiency Motion Pack and noises!
Gentlemen,
I’m not sure that I entirely agree with Lee’s view; any noise from a gearbox is an indication of wear and not something if excessive that should be accepted without investigation.
The idea of the gears bedding in is a possibility with high powers and torques but with the teeth contact pressures that can be expected in our small gearboxes is in my view unlikely. If Lee is right though; then we may have a problem of excessive wear, as once bedded in we get into wearing out stage, where problems with metal particles will exaggerate the problem.
At this time of the year with colder weather when our little darlings are generally relegated to unheated garages, sheds and converted dog kennels rather than behind the settee in a warm lounge; the grease in the gearboxes will be very stiff and any lubrication will be at its worst. Grease lubricated gearboxes of this kind are a compromise not the ideal.
Operation of the gears drives the grease to the sides of the casing where it stays tantalising close to the moving gear parts but not actually providing lubrication.
As a thought on noisier forward motion rather than reverse, I would suggest that as the tank spends more time going forward where grease from the forward drive faces is displaced to the box casing or between the roots and tips to the reverse faces. Consequently when driven in reverse there is a better supply of lubrication, hence quieter running.
As the reverse running is likely to relatively short the lubrication will probably remain better.
The fact that you have raised the issue indicates your concern I suggest that you contact Mark at least just to check the grease specification is appropriate.
Opening up the gearbox and having a look is the only way to really know what is going on.
Although it sounds a bit daft, but try putting a heater under the gearboxes for a few hours, it may get the grease to soften enough to move and be picked up by the gears.
Personally, I come from oil lubricated marine gearboxes of 2000kW and bigger so the above is only a bit of lateral thinking.
Happy New Year
Paul
I’m not sure that I entirely agree with Lee’s view; any noise from a gearbox is an indication of wear and not something if excessive that should be accepted without investigation.
The idea of the gears bedding in is a possibility with high powers and torques but with the teeth contact pressures that can be expected in our small gearboxes is in my view unlikely. If Lee is right though; then we may have a problem of excessive wear, as once bedded in we get into wearing out stage, where problems with metal particles will exaggerate the problem.
At this time of the year with colder weather when our little darlings are generally relegated to unheated garages, sheds and converted dog kennels rather than behind the settee in a warm lounge; the grease in the gearboxes will be very stiff and any lubrication will be at its worst. Grease lubricated gearboxes of this kind are a compromise not the ideal.
Operation of the gears drives the grease to the sides of the casing where it stays tantalising close to the moving gear parts but not actually providing lubrication.
As a thought on noisier forward motion rather than reverse, I would suggest that as the tank spends more time going forward where grease from the forward drive faces is displaced to the box casing or between the roots and tips to the reverse faces. Consequently when driven in reverse there is a better supply of lubrication, hence quieter running.
As the reverse running is likely to relatively short the lubrication will probably remain better.
The fact that you have raised the issue indicates your concern I suggest that you contact Mark at least just to check the grease specification is appropriate.
Opening up the gearbox and having a look is the only way to really know what is going on.
Although it sounds a bit daft, but try putting a heater under the gearboxes for a few hours, it may get the grease to soften enough to move and be picked up by the gears.
Personally, I come from oil lubricated marine gearboxes of 2000kW and bigger so the above is only a bit of lateral thinking.
Happy New Year
Paul
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Armortek
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Re: The High Efficiency Motion Pack and noises!
Hi all
Pauls comments concerning grease lubrication are quite correct. However it has nothing to do with the noise these new gearboxes generate. Nor has whether you are going forwards or backwards and it is most certainly nothing to worry about.
The new high efficiency gearboxes are fitted with patented Davall Spiradrive gearsets. These are hardened steel offset spiral crown wheels being driven by multi start, hardened steel leadscrews. Because of the offset, the gear mesh condition is slightly different in one direction than it is in the other. This why the gearboxes generate more noise in one direction than the other. On some models this will be going forwards and on some it will be in reverse.
The source of the noise is micro fine ripples in the surface of the gear teeth on the crown wheel. These ripples tend become smoothed out as the gears bed in, and the gearboxes get quieter and quieter. This is completely different from what occurs when gears wear out. We know this from experience gained by Davall supplying main gun stabilising systems for NATO main battle tanks. These use an identical gear system.
Armortek (and Davall) are keen to improve this initial noise issue on future builds, and we have been advised that Davall have invested in a new complex CNC gear finishing machine to improve the surface finish of the gear wheels. We will wait to see (or hear) the results.
Just to re-emphasise. It can be noisy when new, but improves with use. It is not an engineering or operational concern. We would not recommend warming or opening the gearbox to have a look, it would probably do more harm than good.
Mark
Pauls comments concerning grease lubrication are quite correct. However it has nothing to do with the noise these new gearboxes generate. Nor has whether you are going forwards or backwards and it is most certainly nothing to worry about.
The new high efficiency gearboxes are fitted with patented Davall Spiradrive gearsets. These are hardened steel offset spiral crown wheels being driven by multi start, hardened steel leadscrews. Because of the offset, the gear mesh condition is slightly different in one direction than it is in the other. This why the gearboxes generate more noise in one direction than the other. On some models this will be going forwards and on some it will be in reverse.
The source of the noise is micro fine ripples in the surface of the gear teeth on the crown wheel. These ripples tend become smoothed out as the gears bed in, and the gearboxes get quieter and quieter. This is completely different from what occurs when gears wear out. We know this from experience gained by Davall supplying main gun stabilising systems for NATO main battle tanks. These use an identical gear system.
Armortek (and Davall) are keen to improve this initial noise issue on future builds, and we have been advised that Davall have invested in a new complex CNC gear finishing machine to improve the surface finish of the gear wheels. We will wait to see (or hear) the results.
Just to re-emphasise. It can be noisy when new, but improves with use. It is not an engineering or operational concern. We would not recommend warming or opening the gearbox to have a look, it would probably do more harm than good.
Mark
Armortek