Fazer Posted June 19, 2016 Share Posted June 19, 2016 (edited) Hi Steve, put me down for a couple of sets !!! great work on the moulds & I look forward to the first casts.... Now, a set for the Manx Norton & the Ducati 750S would do nicely, no rush Mark D Edited June 19, 2016 by Fazer Link to comment Share on other sites More sharing options...
vontrips Posted June 19, 2016 Share Posted June 19, 2016 Yes, from the bar between them to the top Yep, good advice there. Link to comment Share on other sites More sharing options...
krow113 Posted June 19, 2016 Author Share Posted June 19, 2016 (edited) Thanks for the continued input BK , Mark & vtrips. Good advice indeed , however I had mounted and boxed everything already , adding the 2 gates at the top of each hub for good measure. I would hate to fuss around any more at this point. It will be possible to cut into the mould if the suggested gate becomes mandatory. Thanks for the input for sure though. The Manx kit is a def possibilty , love Nortons. I do have some kits in the lineup, but lets see how this goes first. Still finishing the Gotha prop for casting as well. This will be the trickiest piece to cast. The face is flat so I can pour the silicone up to the face to start. Prolly mount with blades at 10,2,7 and 4? o'clock.This has yet to be done so any input can be implemented. And actually looking at this post for a minute I can see this is a real problem to solve. Edited June 19, 2016 by krow113 Link to comment Share on other sites More sharing options...
vontrips Posted June 19, 2016 Share Posted June 19, 2016 Thanks for the continued input BK , Mark & vtrips. Good advice indeed , however I had mounted and boxed everything already , adding the 2 gates at the top of each hub for good measure. I would hate to fuss around any more at this point. It will be possible to cut into the mould if the suggested gate becomes mandatory. Thanks for the input for sure though. The Manx kit is a def possibilty , love Nortons. I do have some kits in the lineup, but lets see how this goes first. Still finishing the Gotha prop for casting as well. This will be the trickiest piece to cast. The face is flat so I can pour the silicone up to the face to start. Prolly mount with blades at 10,2,7 and 4? o'clock.This has yet to be done so any input can be implemented. And actually looking at this post for a minute I can see this is a real problem to solve. I'd hope they would be at 10,1,4 and 7 o'clock (just kidding!) Not sure how I'd handle this one? Be almost tempted to spin cast with the prop horizontal and pour from the top centre of the prop hub. You'd need vents up and away at the tips regardless of technique. That metal will really want to trap air and cool travelling down those prop blades! 1 Link to comment Share on other sites More sharing options...
elderly Posted June 20, 2016 Share Posted June 20, 2016 The Manx kit is a def possibilty , love Nortons. I do have some kits in the lineup, ....... I've dithered about getting an Italeri/Protar Manx Norton, but the availability of your castings would be the decider for me ! 1 Link to comment Share on other sites More sharing options...
Black Knight Posted June 20, 2016 Share Posted June 20, 2016 Gotha prop; orientation sounds fine. I would have an independent air gate from near each blade tip and a wide V pouring gate to the centre hub I would embed a bit of ply wood in the silicon rubber on each half so the mould cannot be squeezed too narrow when its clamped up. >> a thin layer of silcon rubber/ply/silicon r./prop You could go either vertically X, or horizontally, with air gates coming from the prop tips at right angles L Yup, you could always cut an air gate between the hubs after the mould is made. I use a wood carvers U chisel on one half of the mould only when making extra air gates. 1 Link to comment Share on other sites More sharing options...
krow113 Posted June 20, 2016 Author Share Posted June 20, 2016 The prop will be difficult. Staring at it I cant figure out the mould process without the silicone wrapping around the blade 'trapping it. The prop will have to be vertical,and I might have to pour all atb once , cutting the master out after curing. BK Thanks , not sure what you mean about the plywood , and clamping would be lightly as well , I would imagine , in order to avoid deforming the mould. Gates will be at the tips for sure and the big V for the pour gate sounds good , I had some golf tee's around here... Link to comment Share on other sites More sharing options...
krow113 Posted June 20, 2016 Author Share Posted June 20, 2016 I've dithered about getting an Italeri/Protar Manx Norton, but the availability of your castings would be the decider for me ! I'll move in this direction , but have limited casting experience. Let me get the procedure streamlined , then I would be comfortable selling items. I have built custom signs and a lot of other special order items for over 25 years, so selling isnt a prob. I have the kit and the wheels stop me dead whenever I look at them. That middle rim seam, cant abide that...the limits of injection moulding show up in bike kits for sure! Still , lucky to have manufacturers willing to produce classic bike kits. 4 items would be in a wheel set , spokes, rim , hub and nipples , rim locks and air valves could be included as well. Instructions and diagrams too. 2 Link to comment Share on other sites More sharing options...
Black Knight Posted June 20, 2016 Share Posted June 20, 2016 Either embed the prop in plasticine, or use plasticine to build up one side of the blades till they are level. Pour the mould rubber to cover one half, Then for the other half, remove the plasticine wedges along the prop blades, then make the second half of the mould. The plasticine wedges will stop the mould rubber running under the blades trapping them. 2 Link to comment Share on other sites More sharing options...
krow113 Posted June 20, 2016 Author Share Posted June 20, 2016 Thanks BK I was thinking of taping the edge so it would dam the silicone, thats a better idea and I can 'see' exactly what you are talking about. Link to comment Share on other sites More sharing options...
krow113 Posted June 25, 2016 Author Share Posted June 25, 2016 BK's solution is prolly the way to go, I had thought of 'dams' to get the master done. I went ahead and attached gates and .005" plastic card dams just need to heat and curve the last bit of card up to the gates at the end of each blade , be gentle....: Link to comment Share on other sites More sharing options...
Black Knight Posted June 26, 2016 Share Posted June 26, 2016 Are going for a horizontal mould? If its a vertical, with prop vertical, those gates will come out the side. 1 Link to comment Share on other sites More sharing options...
krow113 Posted June 26, 2016 Author Share Posted June 26, 2016 Yes horizontal , I cant see how to get it out of a vertical mould, without cutting, but I do admit I am treading new ground , for me , here. Link to comment Share on other sites More sharing options...
Black Knight Posted June 26, 2016 Share Posted June 26, 2016 You'll have problems getting it out of a horizontal mould unless those gates are perfectly parallel and straight sided. Put the gates at right angles to the way they are now; parallel to the surface of the prop. Place as an X; Air gates from the lower blades being longer than the top two blades Pour the mould in two halves, with the prop mostly in one half. Clamp the two halves together; Turn vertically to pour the w/m in Removal is easier as the pouring and air gates are not enclosed by the rubber. If I get time today I'll mock one up with a 1/72 prop I want to cast in w/m and photo it. 1 Link to comment Share on other sites More sharing options...
krow113 Posted June 26, 2016 Author Share Posted June 26, 2016 (edited) Thanks BK - gonna do it horizontal already there with the master. |I'll try to get it finished today. Dams are at 90 degrees to the blade , I can 'see' how this will go now... Edited June 26, 2016 by krow113 Link to comment Share on other sites More sharing options...
Black Knight Posted June 26, 2016 Share Posted June 26, 2016 okee-doakly 1 Link to comment Share on other sites More sharing options...
krow113 Posted July 23, 2016 Author Share Posted July 23, 2016 (edited) Ongoing , life gets in the way , made the mould box and got the prop into final stages: And just about ready. One can see what will be attempted during the first half of the mould: Edited July 23, 2016 by krow113 1 Link to comment Share on other sites More sharing options...
krow113 Posted August 7, 2016 Author Share Posted August 7, 2016 Finally: ..and the prop: 2 Link to comment Share on other sites More sharing options...
Fazer Posted August 8, 2016 Share Posted August 8, 2016 Looking good Steve, watching carefully to this , Cannot wait for the first castings...... Mark D Link to comment Share on other sites More sharing options...
krow113 Posted August 9, 2016 Author Share Posted August 9, 2016 (edited) YOU cant wait!? Long time coming. Thanks Mark. To be clear these rims will fit the tires from this kit: The only knobby tires I could find easily in 1/8 scale.. Another reason turning in a lathe would be problematic. I have a sign to finish this week, after that I'll have enough time to finish these. Edited August 9, 2016 by krow113 Link to comment Share on other sites More sharing options...
krow113 Posted August 22, 2016 Author Share Posted August 22, 2016 Last half of the silicone poured: 2 Link to comment Share on other sites More sharing options...
vontrips Posted August 22, 2016 Share Posted August 22, 2016 (edited) Last half of the silicone poured: Very professional looking mold boxes! Lego is about as far as I ever manage! Edited August 22, 2016 by vontrips 2 Link to comment Share on other sites More sharing options...
Fazer Posted August 23, 2016 Share Posted August 23, 2016 It will be good to see these when you opened them up Steve, It will even better to see the first casts... Mark D 1 Link to comment Share on other sites More sharing options...
elderly Posted August 23, 2016 Share Posted August 23, 2016 Last half of the silicone poured: It's like waiting for Christmas morning 1 Link to comment Share on other sites More sharing options...
Black Knight Posted August 23, 2016 Share Posted August 23, 2016 Very professional looking mold boxes! Lego is about as far as I ever manage! yeah, Lego is about as sophis suphic .....fancy as I get 3 Link to comment Share on other sites More sharing options...
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