Richard.
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Unreal. That's mad. The tips must be quite special to cope with that.Yep, on the Computurn, it is a beast
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Hood
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Nope, just standard inserts, was sure I had a vid on youtube of it doing 10mm DOC but not found it yet.
Not tried since I put the servo on, it is 12KW but it is 1:1, the original motor was 11KW but was via a gearbox so heck of a lot more torque at lower speeds.
I normally just cut between 2mm and 5mm DOC depending on what I am doing.
Richard.
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Ha ha that would eat mine and for breakfast and still be hungry.
Bet that's got a nasty bite if things go wrong.
Hood
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Could almost fit the ML10 in the toolpost, well not really but it would fit on the saddle with room to spare
Yes, I am still wary of it every time I run a programme the first time. Now I just have the single turret it is not so bad but when I had twin turrets on it I had to be very careful that the code was right, once got it a bit wrong and sheared a tool holder clean off and that was just with a big lump of nylon
Agroshield
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If you want to make these for long-term reliability, you need to consider lubrication.
The originals have nylon bushes with grooves in them and a grease nipple on the casting.
The replacement has some kind of bronze bush, also with grooves in it. This would also seem to be expecting grease.
There is talk of oilite bushes. These do not require grease grooves and should not be lubricated with grease.
The clue is in the name: OIL-ite. Pushing grease into these will block the pores and stop them functioning as designed.
Lubricating them correctly with oil via the nipple may require a different kind of seal to stop the oil dripping out on the floor (unless you want to turn your Japanese truck into a British motorbike).
The originals have nylon bushes with grooves in them and a grease nipple on the casting.
The replacement has some kind of bronze bush, also with grooves in it. This would also seem to be expecting grease.
There is talk of oilite bushes. These do not require grease grooves and should not be lubricated with grease.
The clue is in the name: OIL-ite. Pushing grease into these will block the pores and stop them functioning as designed.
Lubricating them correctly with oil via the nipple may require a different kind of seal to stop the oil dripping out on the floor (unless you want to turn your Japanese truck into a British motorbike).
123hotchef
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I would not expect to be greasing the oilite bushes do they require lubrication at all?
Hood
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You need to replenish the oil every so often. Don't recall the frequency but the info should be on their site. Probably though in the application you are talking about it will wear out before that is required.
Bit of a miss-conception if you have a steel which is tougher and tends not to bend and is working within it's specification it will never fail. Steel is not like aluminium and doesn't suffer from creep. The thing is with steel alloying you can impart a lot of characteristics - simply being harder doesn't necessarily mean it isn't as tough.
WorkshopChris
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The problem is as I understand it the item is now not working "within its specification" due to other modifications to the vehicle. This part looks to be the weakest link in the chain at the moment, if uprated the odds are something else will then become the weakest link.
There lies the never ending conundrum in engineer. Will the next weakest point be a problem within what you are trying to do or is it beyond any reasonable loads encountered in it's life.
Richard.
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Are we confusing hardness, toughness and strength here. They are not the same thing. Something that is particularly hard isn't particularly tough. (Toughness been measured on impact properties) But something that is tough must be both strong and have an element of ductility to it. If it's too ductile it's not tough or strong. There is always a trade off to a degree. This part has failed due to bending but is that a catastrophic failure. No. Making it tougher or harder or stronger and decreasing the ductility might make it last longer but if it does fail will it be a catastrophic failure?? Brad makes a valid point. By "improving" one aspect of the design you could seriously be effecting another.
There is not always a total trade off due to the fact of alloying, heat treatment and the quality of the steel = impurities. We can talk about yield points, elongation, tensile strength, hardness etc.
But the point is
'Safer to have a softer material that will bend rather than something too strong that will fracture. Be very careful.'
Is a loose term, just because a steel bends easy it doesn't mean it won't finish in catastrophic failure.
123hotchef
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there is always going to be a weakest link somewhere, if I get this made or purchase a made one I will find the next weak point soon enough.
Brad93
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Everything has its Yield and UTS. I'm trying to put it in simple terms for the guy Rocketman, not engineers/metallurgist lingo. I'm not an automotive engineer, I'm not a metallurgist, I'm a welder who gets a bit more involved at times, and all I'm pointing out is by changing materials, does the OP actually know what the result would be when that part is loaded.
Richard.
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There is always a trade off when you make changes to a metal property. Usually strength or ductility you cannot increase one without decreasing the other.
I'm not an automotive engineer so I'm not qualified to say what that part is designed to to or be when it's limits are reached. It's clearly taken a knock and the driver has lived to tell the tail. Yes a bend can be catastrophic and so can a complete shear. They've designed it to bend so with that in mind I'd be making the next one with the same thought process unless someone more qualified can say otherwise.
Richard.
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I don't honestly know but Malleable metals are generally quite soft and easy to deform from all manner of inflicted forces on them I'm not sure that would be a useful property on something that's likely to take a clobber. At a guess I'd say that part is possibly case hardened. This gives you the wear resistance required from the rotational side of things. It moves inside that housing and i would say a hard crust around that pin would offer protection especially if you forget to grease it.
When something is case hardened it's only the outer crust that is hard which is the beauty on something like this because in the event of a bang like shown above it still has that lovely ductile core that will quite happily deform rather than break completely. Now I could be wrong on that, it might be made out of something else completely but that's what I'd say it Would likely be.
Richard.
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Malleable metals can be easily deformed from impact or compression. Squashing them, hammering them, flattening, rolling them etc.
Copper, various aluminium grades, gold, brass, silver are all very malleable metals.
Ductility is a property where a metal can be bent or twisted, stretched, past the point of permanent deformation. The more ductile it is the more it will be able to deform before it breaks or tears. So with ductility your measuring tensile strength and with malleability it's compressed strength.
Most very malleable metals are very ductile too. Infact I can only think of one that isn't which is lead. Very malleable but won't bend for nothing before it breaks. I'm sure there are more but my heads hurting lol. Some aluminium grades are malleable but not ductile unless first annealed.
Very hard metals have great wear resistance and to a point impact resistance but your dead right with high hardness comes high embrittlement and after that point an impact could cause it to fracture or crack. a tough material is a material that's got good impact properties and it's an impact test that's Carried out to measure it. Charpys. A strong material is one that can take a large amount of force before permanent deformation. Strong materials are not very ductile and usually at that point of deformation high strength metals will quite often break. A ductile metal will deform much easier but will bend as a result.
High strength metals have elasticity and with pressure they deform but when the pressure is released they often deflect back into normal state
