Thor, or should that be Zeus?

[Chaz]

Starting to finish off the mold for the first casting as well as one of the bearing holders for my Y leadscrew.

The part was flipped over as its 50mm deep, my probe doesnt have the best accuracy so there is a 0.2mm or so step, doesnt affect the part however.

[Chaz]

Managed to pour the mould today.


Some lessons learnt.


1. Make the mould stronger.
2. You use mix than you expect .... dont ask me where it all goes.
3. It's tedious .... just stick with it.


Here is the mix (0.2 water / cement) mix without superplastisizer.


https://www.youtube.com/watch?v=2IeEhFW44F8


Add some magic juice and it changes completely. Just to make it clear, the mix below has no more water, just 1.25l of plastisizer.


https://www.youtube.com/watch?v=4KfWcawy7b4




Just checked the pour now, still very liquid. One of the boxes moved but as it wasnt set yet I was able to fix it. Hoping that it will harden overnight.

[mekanik]

Hi Chaz
I hope this is going to be OK, the cross section is very thin and if you haven't placed rebar in that lot i envisage problems(hope not)
regards
Mike

[Chaz]

Hi Chaz
I hope this is going to be OK, the cross section is very thin and if you haven't placed rebar in that lot i envisage problems(hope not)
regards
Mike

Hope so too. The main section is fairly thick (200mm), the ribbing is for extra support. Those are 50mm wide.

[Fenza]

Have you got any images of the final design you settled on Chaz?

50mm thick UHPC is pretty strong!

[Chaz]

Have you got any images of the final design you settled on Chaz?

50mm thick UHPC is pretty strong!

Ill upload some. I need to rethink the gantry. I need to use less concrete. The plastisizer cost a fortune ...

[Fenza]

http://www.moertelshop.com/PCE-Flies...uenstig-kaufen
Polycarboxylate is the normal liquid superplasticizer. The shop I just linked seem to be pretty good and reasonably priced.

I'm going to try them out for some of my own experimentation.

Cheers,

Fenza

[mekanik]

The ribs won't add any strength without rebar. the mix for small cross sectional beams/lintles ect is 3parts aggregate(10mm) 2 parts sharp sand 1 poart cement. but you still need the rebar.
i feel really bad about this as i should have mentioned it earlier.
But you seem to have gone into it in detail as you have with the rest of the build.
Mike

[Chaz]

The ribs won't add any strength without rebar. the mix for small cross sectional beams/lintles ect is 3parts aggregate(10mm) 2 parts sharp sand 1 poart cement. but you still need the rebar.
i feel really bad about this as i should have mentioned it earlier.
But you seem to have gone into it in detail as you have with the rest of the build.
Mike

No problem. Lets see how it holds out.