I have a steamer similar to the one pictured, connected to a 6" diameter PVC pipe sealed at both ends.
This setup worked for me once or twice to bend some fairly large combs for windsor chairs, say 3" wide and an inch thick, and a couple of 3/4" X 3/4" sack back chair back hoops.
Currently I am having problems with steaming about 1" wide arcs for windsor chairs arms. The system suddenly just does not seem to get the wood steamed throughout enough to bend much, even after steaming for 2 hours. The wood will not wrap around the form. Do you think the steamer just wore out after a half dozen uses?
Thanks,
Rick
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