key break

[meccanicamg]

Thank you very much for the quick answers. then the reducer is for a tree of a barrel, and there are therefore frequent start and stop, in fact to disassemble the reducer, the mechanic has removed the pulley that connected it to the electric motor and under was mounted a drum brake to allow these start and stop, and the mechanic says that precisely because of what the shafts of the gearboxes are subject to very strong and frequent pickets.
so with frequent start and stop you prefer the stickers and not the tabs?

if a tree is particularly subject to inversion, you pass from one to two tabs and if it is particularly severe you go to the parallel or evolving groove.
in this way the pressure is divided on several surfaces that decrease tensions in the shaft and the hub, clearly increasing the cost.
In other cases, where shaft and hub have high mechanical characteristics (hardened and tempered alloy steels or only hardened) you can make piece tab in 42crmo4 hardened, so as to bring pressure also of 200mpa order without compromise.

 

[TETRASTORE]

It would be interesting to have a photo of the breakup to see the areas affected by fatigue and understand where the trigger broke out.

Öannak it would be interesting, if possible, to see also the state of the teeth after so many years of operation.

 

[Archimed&]

Sorry, but talking about a half-designed reducer I'd say you can't see.
I took a two-stage reducer randomly that we already used on the forum and on this we make a reasoning.
I don't want the builder... we use this design because it is done well and not because it specifically has a problem.
View attachment 71044from what I understand, it broke the tongue (and not flash drive otherwise the gears turn eccentric) that transmits the pair to (18).
the break occurred on the height h of the tab.
It would be interesting to have a photo of the breakup to see the areas affected by fatigue and understand where the trigger broke out.
It usually happens that it is the tree to yield to fatigue for alternating twist or button.View attachment 71045the net separation of the tongue can take place to cut for the sliding of the grains on the division because of a net blow, always that tree and hub, unscrupulous, do not break. if the tab has the broken grains because maybe tempered but not found can create this problem if overloaded. but even if natural and tree and hub very hard....the tongue pulls.
View attachment 71046I'll leave you This is link to see what happens with hardened pieces and not.
It is nice to see two things: a student who loves to go to the workshop to look and get his hands dirty. even better a girl who has curiosity and touches mechanics. Never give up.

That video is super interesting, how nice to learn new things. Thank you.

 

[rinato]

[omissis]the inertia force that defines low and therefore neglects it in the calculation, is that of the material contained in the barrel since, not being solidarity in rotation, the author considers it low and therefore negligible.[omissis]

Forgive me if I interfere, not being in the industry, but the material in the barrel is leather and chemical solutions for the tanning, right?
the mixing wanted of the above-mentioned leather in the solution does not cause a "pulsant" load, such as the one observable on a basket of any domestic washing machine? and this doesn't make loads worse on the reducer? this would be an aspect that if neglected would drastically shorten the life of tabs or teeth of the scratches.
or is there a bottal filling criterion to obtain a reasonable absence of pulsations?
I guess there's a dimensioning of the whole machine, but is the scarboard priceable?
or, at some point, the sizing can only be empirical?

 

[meccanicamg]

Forgive me if I interfere, not being in the industry, but the material in the barrel is leather and chemical solutions for the tanning, right?
the mixing wanted of the above-mentioned leather in the solution does not cause a "pulsant" load, such as the one observable on a basket of any domestic washing machine? and this doesn't make loads worse on the reducer? this would be an aspect that if neglected would drastically shorten the life of tabs or teeth of the scratches.
or is there a bottal filling criterion to obtain a reasonable absence of pulsations?
I guess there's a dimensioning of the whole machine, but is the scarboard priceable?
or, at some point, the sizing can only be empirical?

looking at what is reported on manuals specific to fatigue, it is not considered the "language" element as an object that undergoes fatigue but only the tree.
There is no doubt that specific pressures can be considered, but it is not really quantifiable that variable behaviour can be.

 

[TETRASTORE]

The material in the barrel is leather and chemical solutions for the tanning, right?

sì.

il rimescolamento wanted of the above-mentioned leather in the solution does not cause a "pulsant" load, such as the one observable on a basket of any domestic washing machine?

the operation is a little different; in the basket of the washing machine there are transverse steaks that even with vacuum expose a surface that, although minimal, opposes a resistance to movement in water considering also that the number of turns of the basket in the washing phase is greater than 60 rpm; the shabordìo is caused by the rounded heads that roll or are lifted and fall on others and in water.
in the barrel generally there are conical pioli that, in the absence of skins do not expose surfaces that tend to lift the liquid therefore, with the only liquid, there is a limited resistance determined by the friction of the latter on the wall of the barrel, also according to the low speed of rotation (4-8 rpm approximately).
when the skins are introduced, the pioli have the function of hooking those below and dragging them up; being conical, the skins, during rotation, slip and fall on the top layer for which it is not all the mass that moves like in the washing machine. a minimum of sabordìo is also present in this application but to a minimum extent and, in my opinion, not such as to cause problems to the tabs, if mounted correctly with the right tolerances.
in the case of loads push buttons much higher than those of the barrels, the tabs and their seats could suffer a recalculation and oxidation from contact, without being cut off, than in the time producingber game resulting in noise and subsequent avary of the system.

 

[rinato]

looking at what is reported on manuals specific to fatigue, it is not considered the "language" element as an object that undergoes fatigue but only the tree.
There is no doubt that specific pressures can be considered, but it is not really quantifiable that variable behaviour can be.

Clear, thank you.

 

[rinato]

Yes.

the operation is a little different; in the basket of the washing machine there are transverse steaks that even with vacuum expose a surface that, although minimal, opposes a resistance to movement in water considering also that the number of turns of the basket in the washing phase is greater than 60 rpm; the shabordìo is caused by the rounded heads that roll or are lifted and fall on others and in water.
in the barrel generally there are conical pioli that, in the absence of skins do not expose surfaces that tend to lift the liquid therefore, with the only liquid, there is a limited resistance determined by the friction of the latter on the wall of the barrel, also according to the low speed of rotation (4-8 rpm approximately).
when the skins are introduced, the pioli have the function of hooking those below and dragging them up; being conical, the skins, during rotation, slip and fall on the top layer for which it is not all the mass that moves like in the washing machine. a minimum of sabordìo is also present in this application but to a minimum extent and, in my opinion, not such as to cause problems to the tabs, if mounted correctly with the right tolerances.
in the case of loads push buttons much higher than those of the barrels, the tabs and their seats could suffer a recalculation and oxidation from contact, without being cut off, than in the time producingber game resulting in noise and subsequent avary of the system.

Well, I missed the barrel regime. actually at 4g/1' the cleaning of a load so described would seem to be few % of the total load. Thank you.