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  1. creast

    ’Rolssi’ a 1936 vintage 4-stroke engine of Finnish origin.

    Beautiful workmanship and such a great detailed video. Spot on! 😁
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    What Fillament, wall thickness and Fill Percentage for Patterns

    For me, printing patterns wins hands down and only requires a little forward thinking on how they will be used. I've never had a problem damaging my patterns when removing from Petrobond as I don't have the luxury of resin bonded sand. It's a case of horses for courses I guess.
  3. creast

    Anzani Fan Type 1/4 scale model

    Ken, Thank you for taking the time to do this. I must say on reading your build log I am extremely impressed with your talent in the the machine shop and I am resisting asking too many questions to avoid swamping or misdirecting the thread as often happens on this forum. Cheers Rich
  4. creast

    Threading and the compound angle.

    I leave mine parallel too but only because my ML7 can't swing round that far. It does mean a heavier cut but I can live with that. Rich
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    Anzani Fan Type 1/4 scale model

    Hi Jason. Thanks for pointing that out. If you were an engineering workshop you would expect to see each part fully dimensioned and not have to hunt around the drawings translating dimensions. I fully understand that as hobbyists we don't expect the drawings to include tolerances and we use our...
  6. creast

    Anzani Fan Type 1/4 scale model

    Thanks Ken, When I finally get the model ready for publishing on GrabCad, that's if.. lol, I will consult with you and give credit to you as author of the original design. I will not include your pdf drawings unless approved by yourself. I only just got your original build thread which explains...
  7. creast

    Anzani Fan Type 1/4 scale model

    Hi Ken, Thanks for the above information and offer to answer queries, I appreciate that. I always build a 3D model when working from plans so I can check how everything goes together and moves before actually making one for real and it has proven a good checking tool in the past. Also, I publish...
  8. creast

    Jerry Howell's V-four in 3d printed form

    I would just like to add my two pennies :) Almost all of the plans I have built from I have converted to 3D models in SolidWorks and published on GrabCad . I can say that most plans have inevitably had some missing dimensions and I have had to guess or should I say use my Engineering judgment ...
  9. creast

    Anzani Fan Type 1/4 scale model

    I have to comment that on trying to construct this in SolidWorks I have discovered several missing dimensions whilst drawing the crankcase assembly but more so on the crankshaft/flywheel assembly where many details are missing. Photos of the build indicate the crankshafts having some form of...
  10. creast

    What Fillament, wall thickness and Fill Percentage for Patterns

    I am not sure if this helps but for sand casting where the patterns could be used again I generally print in PLA with a 0.4mm nozzle and set wall thicknesses to 1.2 mm and 20% infill is usually ok. I also do lost PLA where I reduce the wall to say 0.8mm and infill of 10% but I guess you are not...
  11. creast

    Introducing myself as a newbie

    Welcome. It's great to see a teenager taking interest. We all have to start somewhere so don't be too daunted by not having all the tools as this will be a gradual journey. All the best to you Rich
  12. creast

    Help requested with casting

    Machinery Handbook quotes between 1/8" to 5/32" per foot so my allowance is slightly high but works for me too. Rich
  13. creast

    Help requested with casting

    What are the rough dimensions of the crankcase? Another thing to consider is shrinkage of the casting, I usually scale up the model by 1.015 and also add extra to any surfaces that need finish machining. Rich (UK Leicester)
  14. creast

    David Kerzel plans

    I originally built mine with cast iron rings but had great difficulty in getting it to run. Eventually I replaced the rings with a single Viton T seal with reduced squeeze and it still runs today. Rich
  15. creast

    Petrobond

    Sorry but I disagree. I have never had to add more venting than normal greensand moulding in more than 10 years of using this sand. Rich
  16. creast

    Petrobond

    I would say you are pouring too hot. I always use a thermocouple to check pouring temperature or use an electric furnace with temperature control. I would advise you buy a small quantity of real Petrobond or equivalent to test your technique before experimenting with home brew recipes. Rich
  17. creast

    How I store waste oil for my burner.

    Thanks for that excellent explanation 👍 Rich
  18. creast

    How I store waste oil for my burner.

    Thanks for that information. I did wonder as I read somewhere that checking the pouring temperature can be done by dipping a steel rod and if it comes out with a pointed end from melting it's ready. Not sure if it's true and surely it's possibly changing the iron properties?
  19. creast

    How I store waste oil for my burner.

    Hi LuckyGen I have been following your Youtube channel for quite a while now and thoroughly enjoy your videos. One question, when you remove the dross before pouring, is the tool you use regular steel or stainless? Will it melt quickly when doing it? Cheers Rich
  20. creast

    Lost 3D print Resins?

    Ha ha. I know what you mean about the memory issue 😁 No worries.
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