Alternative to Bronze?

[VicParticipant @vic]

For nuts? Just seen this on YouTube.

https://youtu.be/pfIigzCFJ4o?si=M0P3j9VnKawsFYxi

 

[noel shelleyParticipant @noelshelley55608]

Unless I’ve missed something WHAT is this material ? Blue plastic, I was using moly filled acetal 30 years ago. As to being a substitute for bronze, I think that’s stretching things a bit ? Noel.

[Neil LickfoldParticipant @neillickfold44316]

I didn’t catch what the material actually is.

We used to use various forms of Turcite around 30 odd years ago, mid 90’s to about 2000. Some were metal filled, others had different fibres added etc.  Then went back to bronzes, like LB2 and Ali Bronze. Now we buy the bronze with the carbon rod through it. That seems to last the longest for bushes on hard steel pins. The moulding machine platterns and tie rods , use the carbon plugged Ali bronze bushed. The bushes were still within the original machine specs, and the rods/bars needed to be replaced in the service last year. Normally it is both bushes and the rods/tie bars are replaced after about 6 years or so.

[peak4Participant @peak4]

The specific material is RIMAMID from what I can work out

Russian – English translation of manufacturers page here
https://rimamid-ru.translate.goog/?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc

See also
https://iopscience.iop.org/article/10.1088/1757-899X/969/1/012021

https://iopscience.iop.org/article/10.1088/1757-899X/969/1/012021/pdf

Bill

[duncan webster 1Participant @duncanwebster1]

Anyone holding rectangular stuff in a three jaw chuck, or using a tap as a centre punch should be taken away and chastised severely

[bernard towersParticipant @bernardtowers37738]

Couldn’t agree more, why would we believe the rest of it?

[mark smith 20Participant @marksmith20]

Its supposed to have 10x the wear resistance of bronze.

Some stated advantages over metals:

 

[larry phelan 1Participant @larryphelan1]

The big question is—how much is it ????

[larry phelan 1]

On larry phelan 1 Said:

The big question is—how much is it ????

And where can it be bought?

Looks like a decent enough engineering plastic to me, though the claim that it replaces Bronze is surely hype.

I thought the demo at the end showing the plastic nut had zero backlash was misleading.  Not difficult for a new nut made of anything to pull that trick.   What I want to know is how long the plastic nut lasts doing real work before the thread wears.  And how does it compare with Bronze doing the same duty.

Might well perform better than Bronze for this particular function, in the same way Kevlar and Carbon Fibre both outperform steel in certain applications.  Won’t be magic though.

Amusingly, one of my design books recommends using plastic wherever possible.  The main exception is a recommendation to use “metal to create the illusion of quality”.  It applies to many household objects.  Fans of traditional metalwork are invited to dissect their vacuum cleaner.  Do so and weep…

🙁

Dave

 

[mark smith 20Participant @marksmith20]

i dont think its obtainable anywhere in the west. So unless your in Russia………… . I bet there are similar types of composite plastics available in the west with similar properties.You only have to look on google to see the 100’s of novel plastics around .

[PeroParticipant @pero]

Based on the name I would assume that the compound in question is an aromatic polyamide or aramid, as is Kevlar. It is likely however that there are differences in molecular structure between the two – if only for patent reasons.

Perhaps more critical issues are how the amide fibers are bonded, epoxy? nylon? acetal? to create a fiber filled solid and also how much fiber is in the mix. These will affect both wear and slipperocity (new term for the occasion).

From a quick internet search Kevlar seems to be readily available in solid form as Kevlar filled nylon – at eye wateringly high prices!

Pero

[peak4]

On peak4 Said:

The specific material is RIMAMID from what I can work out

Russian – English translation […]

The plot thickens:

https://www.drive2.ru/l/503003755914986160/

MichaelG.

… impressively:

https://youtu.be/WNo67yx5Bms?feature=shared

 

[Pero]

On Pero Said:

[…] Perhaps more critical issues are how the amide fibers are bonded, epoxy? nylon? acetal? to create a fiber filled solid and also how much fiber is in the mix. […]

?

According to the bullet-points that Bill posted … it’s homogeneous

I wonder: at what level of detail ?

MichaelG.

[peak4Participant @peak4]

A couple of assorted links to  alternative plastics & suppliers with some useful info

EsingerPlastics; tick boxes on left hand side to compare products

Bay Plastics

Direct plastics; a smaller range, but was local to me in Sheffield before they moved to a new warehouse, but they now list offcuts

Bill

[Author]

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