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I see after several years of periodically visiting this forum peteng still doesn't let the facts get in the way of gushing out a new load of bs......... and then he keeps flogging his dead horse...

@JohnMcNamara

That's interesting (as shown in the cad layout). Simple, and old school, reliable, good engineering - I like it. It doesn't add much mass to the moving/accelerating parts (gantry,...

Thanks for that, a number of people have referred me to that type of information, but as previously posted - I have that information already and have looked at lots of other manufacturer technical...

Peter, you are completely full of it. You seem to be purposely posting misleading information to suit your negative agenda. Someone reading your post would likely assume that polyester composites...

Peter, I think optimisation/variability is maybe referencing the ability to vary the laminate in specific areas to help with localised requirements, for example bearing/buckling and locations for...

That stuff all looks pretty damn awesome, (I don't think it really matters what you use for the concrete material, those inserts/mountings look bombproof)

The consideration is not of epoxy resin in isolation but rather of the finished composite material, in this case the aggregate and binder combination.

The reason to use epoxy is because it has...

You should be able to buy pre-washed aggregate. I can buy pre-washed aggregate (supposedly 300 million year old greywacke) from local suppliers. Landscape suppliers I think they are. You just need to...

The strength (UTS) will allow it to hold fasteners/inserts better, and allows for less material used for the same strength.



10kg? and the rest! One liter of concrete volume will weigh approx...

It is possible that that Sudholt-Wasemann Nanodur®-concrete E45 has a water-based polymer additive. But all uhpc does not necessarily have that. All uhpc is not equal.

Yes what you say is correct, but uhpc is still a cement concrete with water and what I posted is also correct. 15 MPa is not that impressive. Re solid sections, if you look at other video of concrete...

I would suggest that you consider polymer concrete rather than cement concrete. Epoxy concrete will be stronger and give you a nicer surface. Epoxy or polyester concrete/granite (also known as...

Regarding epoxy for leveling beds for linear rails.

1) My experience with this was unsatisfactory. Checking results with my precision level, straight edges, feeler gauges, etc, I found the results...

Don't worry about the flak, mate. At least not on this thread. I am interested.

The reason for trying less conventional methods, i.e. not machining these beds, is due to their size and the...

The epoxy was just the 'flat & level' foundation for the (metal) machine bed plates to sit on.

Awesome feedback, thanks very much. I had already considered this, and back myself to be able to get precision results with an angle grinder, sander, scraper, etc, but goddam it, it is a lot of...

Hi Peter. The beam is built and the proof will be in the pudding. Regarding mass and moving fast (accelerating), this is one of the primary design considerations of course. I fully understand the...

Thanks for the comments Peter. I understand what you are saying, but i can say that:

1) Most fibre is in fact on the outside.

2) the method of constructing a large beam without a mold utilises...

What flatness values are you measuring with that method awerby?

HSK versus ISO ......

It is not one versus the other, they are different things??

HSK is obviously specifically for high speed applications, high-speed-machining toolpaths.

ISO spindles...

I think that I can officially declare that self leveling epoxy sucks.

Maybe for small areas it is ok, but for longer beds it is just not possible to get it to flow out flat enough. Even when...

Hi Zorbit. What CAM do you use for simultaneous 5-axis machining?

Hi there. Is that an available package? If so, where from? What is that spindle? What is the Z travel on that machine? I had only seen flat panel Morbidelli machines, but that is obviously something...

Back to work on this now. Did not progress on it for the last six months, but will hopefully be posting some regular progress from now on!!! The clock is ticking.

Just finished bolting up the...

Re-reading some earlier threads on composites stuff and thought to post these pics of what a temporary oven/hotbox looks like.

Inner skin of foil faced foam, outer of clear plastic, on a timber...

Like in the earlier post, cheap sound absorber solution is second-hand 1/2" foam carpet underlay. And/or pure wool carpet (fire retardant).

If you want a nicer/cleaner outside face it can be...

Hello Skan. Without being uncharitable to you, I suggest that your lack of knowledge about all aspects of your question is broad, and this fact makes your question contradictory, and therefore...

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If you are an engineer trainee then you should be giving this question to your supervisor, but in answer to your question I would say that you cannot really calculate for this situation. Rather, you...

Thanks, it is good when there is finally something to see for the work.



At that stage now, will make some decisions this week.



Yes, it worked out pretty much as planned.
- the cross...