Sand casting model engine crankcase

[@valic000]

Very nice Olli! Very clever with the plate to have split the casting in half. I usually make a 2 part pattern, but that is more work of course. Great idea! The finish is very nice!! Compliments Olli!!

[@OlliKarhun]

Thank you Peter! I made the pattern first and learned after that that many use split pattern 🙈 Luckily the split plate works nicely, ofcourse it is a bit of a chore to make one but the copy of a drawing got me close and then a lot of filing was involved.

[@kencroft7933]

@@OlliKarhun I always used match-plate patterns and I made a fixture to withdraw the pattern without disturbing the sand. Basically I copied the method used by the late Gerald Smith as described in the article he wrote for some model engineering magazine years ago.

[@OlliKarhun]

@@kencroft7933 thanks for the info Ken. That would definately be an interesting article to read!

[@jirvin4505]

Yes it would be interesting to read the Gerald Smith article

[@pakster9879]

very informative video, thanks a lot Olli !

[@ixb1]

It looks just perfect!

[@tinayoga8844]

When you quenched the part I wondered if you know that you still have to go through a heat cycle to harden the part. Then a couple of seconds later you have the shot of the part in the oven. And I thought, "Someone who knows what he is doing".

[@erickgalaz5585]

Greetings sir... what type of aluminum have you used for the monoblock? Is it conventional aluminum scrap from windows or aluminum scrap from car/motorcycle pistons? What degasser have you used? ...I'm his fan, also of Valic and Rodrio Castellanos

[@OlliKarhun]

Hello Erik, I did use AlSi12 aluminium that I got from the local foundry and I did use nitral c 19 for degassing of the melt. Degasser with a preheated bell plunger at about 780 and right after that a drossing flux and scoop it off the top of the melt. Then measure temp again and start pour at 650-675. Last pour I started at around 630 as the melt had cooled off a bit more than I wanted but that worked also fine.

[@erickgalaz5585]

@@OlliKarhun ...I really appreciate your answer, and your advice. I hope soon to be able to achieve some castings, at the moment I have (still unfinished) the patterns of a Nova and Deezil in mdf and wood, and a Satelitt (David Andersen 1cc) in 3D plastic. But first I'll try a base for engine tests.

[@anuarabdulsamad2688]

no core insert..?

[@5b4aezmarinoscyprus71]

Hi Olli, I'am just wondering if i can get a 3D printing files of this moulds..