My uncle just dropped off the draw center style grates for his union caboose stove, the draw center is missing but I have a pattern for one that fits, however one of the ears that it sits on is broken off so I will need to make one and have it cast, get me your measurements if it’s the same size I’ll have 2 sets made
Would schematics like that, with measurements, have the cast dimensions? ... then the pattern maker would use a shrink rule when creating the patterns.
Those are great questions!!gardener wrote: ↑Mon. Dec. 09, 2019 3:12 pmWould schematics like that, with measurements, have the cast dimensions? ... then the pattern maker would use a shrink rule when creating the patterns.
OR vice versa, the measurements on the shematics are of the pattern and the pattern maker uses a standard ruler?
Sometimes the cast parts have to match up and fit with non-cast parts on the same project. Could get confusing. The traditional way is, all the casting drawings I've seen and worked with do the compensating for shrinkage when the pattern is made, not when the drawing is made. The drawing just specifies the material or alloy to use for the cast part.gardener wrote: ↑Mon. Dec. 09, 2019 3:12 pmWould schematics like that, with measurements, have the cast dimensions? ... then the pattern maker would use a shrink rule when creating the patterns.
OR vice versa, the measurements on the shematics are of the pattern and the pattern maker uses a standard ruler?
D.lapan wrote: ↑Sun. May. 12, 2019 2:54 pmHere are a few of the base burner patterns one is the back obviously of a 12” st nick and the other is a side panel, these had cast barrels which from what I understand are always broken, I have the patterns to make the whole stove
< pictures of two St Nicholas patterns >
Personal preference is that I find the St Nicholas stoves beautiful as a whole, but when my focus is on the decorative reliefs, like on a particular section, I do not care for it. Its not wrong, just personal preference. It has caused me to ponder why. I think I may have identified the reason. This is more a question for confirmation than me positing. School me!
That was a thought I had, on the lower portion of the body those flowers / stars surrounded by the dimples look replicated like someone carefully cookie cutter pressed them in, at least for the original metal production pattern (not for every cast piece).Sunny Boy wrote: ↑Tue. Dec. 10, 2019 12:32 pmOn some parts, you can see that the part/date casting numbers are a separate tag - possibly pressed into the molding sand after the pattern is carefully removed before pouring the molten cast iron. In large production there likely was many duplicate patterns to speed up the molding process, but there may have been one guy who went down the line pressing that part/date number in before the mold copes and drags (forming the mold flasks) were assemble ready for the pour.
On some, you can see the castings showing the form of the screw heads used to hold that part/date tag to the pattern, added on rather than have it carved into the wood.
So, some details may be added after the main pattern is removed. Unless we can see the original patterns, it's tough to know.
Paul
