Quote:
Originally Posted by Don Rotolo
In 2005 we had a telescoping arm which had HDPE (High-density polyethelene) blocks inside on which the aluminum rectangular form slid, instead of rollers. The friction is quite low, the simplicity, stability and durability quite high. Let me know if you need more details.
Don
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We did the same thing (same year too) and I would warn against it. Although the basic design is solid, we discovered that HDPE blocks cut in dry, cold January don't work too well in humid, warm Atlanta. Instead of HDPE, I would used UHMW (Ultra-High Molecular Weight) Polyethylene, which doesn't have those problems (or, at least, not anywhere near as bad).