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Old 10-17-2012, 06:17 PM
bigjohnsons34 bigjohnsons34 is offline
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Default Square to round

I've finally figured out how to lay out the square to round fitting, and it's not as hard as I once thought. Question: How do I lay out for the collar. How much allowance do I add and how do I attach the collar ?
Thanks in advance
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Old 10-17-2012, 06:55 PM
dg_tinner dg_tinner is offline
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Yes they do look more difficult than they actually are. As far as an answer to your question for collar layout just make a stretchout of the diameter of the round (plus allowance for spot welding together) For attaching the collar there are several different ways, our shop will slightly flare a half inch of the bottom of the collar so it fits over the top of the square to round and spot weld or rivet, the way i like to do is roll a 3/8" bead and leave 1/2" left under the bead and notch it and fit it inside the sq. to rd. and fold out the notched part to shape it closer to the body of the fitting and spot weld ... similiar to a start collar. it looks really nice. or you could gore it and spin it together like the way adjustable elbows are made... not as strong but also looks good. Hope this helps
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