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https://grabcad.com/library/merlin-v12-olsryd-1

Give or take 15 minutes when started from cold . For abt 5Kg ( 11 Lbs ) of metal . Once molten , I add sodium carbonate to degass . It is pushed to the bottom of the crucible with a plunjer and it causes gas bubbles . These gas bubbles drive out hydrogen dissolved in the molten metal ...

Here's my furnace btw just in case someone is wondering . A propane tank and a mix of perlite and fire cement . Bolted to an old lawn mower chassis makes it easy to transport and store . Propane powered for now , wast oil burner in the near future .

I'm quite sure the alloy isn't the issue here . All my raw materials are either alloy wheels or recycled castings from medical equipement like centrifuge buckets and rotors . No ectrusions , and certainly no soda cans . That is a complete waste of time and fuel . Besides , the first one came out...

You're quite right about he mould castings . I poured one side , and noticed the riser didn't fill up . So in an attempt to save the casting I poured from the opposite side . No avail , the other side also froze up . 150 to 200 lbs , that is quite something . How big a crucible do you use...

Yes indeed , frightning somehow .

A future project is making modular flasks . Once again a myforboy design . The idea is to be able to make different sizes of flask by combining various panels . With three sizes it's possible to make several different flasks like a small square , a medium square and a large square and a couple...

While I was at it , I made some ingot moulds . Cut out of 3mm steel with a plasma cutter and tig welded together . Angles are 10° , witch is more then the usual 3 or 5° . Casting ingots is really a waste of fuel , unless you have a way of controlling and refining the alloy . The reason I...

One of the first castings anyone doing foundry work will probbaly make . A sand rammer . Altough I've used a hammer handle for several years now to make my moulds . This rammer was designed and given to me by myfordboy . If you want to learn or to know more about foundry work , pattern making...

It's been quite a while since I fired up the furnace . This weekend I finally had the time to melt som ali , make a few moulds etc . Here's the first . This beautifull flywheel was designed by ken brunskill . He mailed it to me , and I just scaled it a little and put on some pattern draft ...

A fine runner Félicitations ! You dindn't use the governor as gar as I can see ?

I can confirm that the code runs flawlessly . I use an old A3977 based stepper driver . It's a 1/16 single chip driver . Not the best driver n the world , but for this application it is more then enough . I've used it many times over the past year without even a glitch ...

Commercial compression testers work with a shrader valve from a bicycle tire . Valves from a car tyre have a higher opening pressure . I found out when I made an adaptor for my tester and used a car tyre valve . Compression was abt 1.2 bar lower then with the tester's original valve . This...

will be folowing along

Great Terry , another runner . And what a beauty it is ! My suggestion for a next build would be the snow engine . Pat

Abt 10 years back my son had some solidworks initiation in highschool . His teacher gave everyone a working copy on a thumbdrive . As my son is not really interested in drawing he doens't have it anymore but some of his friends do , so I could easily get a hold of it , and that was what I...

This one Brian ? Bought a copy on ebay for a full 6.50$ :) Can't go wrong there can I .

I've been using 2D cad for some 25 years now . Started with autocad for dos R12 , and used it until some years ago when I couldn't get it to run anymore on a Core i7 machine . Someone on this forum recomended draftsight , wich was free at that time . Immediatly loved it , used it for several...

Great job , thanx a million for sharing . Pat

I'de be happy to help out , but I didn't receive a private message .