Thanks guys, both posts have something new for me.
I had thought there would be some archetypal differences between the two, but the two graphs and Veinott's description would say not. Yet the fact that the 2 types, by design, reach rated power at different revs (Cap start's at 95% of...
My query is around the relative torque output of Capacitor Start (CS) and Cap Start/Cap Run (CSCR) induction motors, especially when they are loaded up to the point where they will stall.
My investigation to date turns up the graph at the top of the attachment to illustrate torque vs motor rpm...
Hi Guys
Sorry haven't got back to you before now.
Used your suggestion straight away. Of course that's the right way to calculate it , but the answer didn't turn out as I thought it would and I'm still trying to figure out where the errors are.
If 27.3lbf pulls the blade over 1/2" at the centre...
Hi guys
I’m trying to work out the mechanics of ‘tension measurement by deflection’ in a bandsaw blade.
The bandsaw has wheels spaced 20.57” apart and a 'properly tensioned’ blade takes 27.3lb ±0.5lb to deflect ½” in the middle of its span measured with a cheap digital airport luggage weigh...
Thanks for those insights . Yes you're right, any damage or wear will cause the blade to not cut straight, however I am looking for the cause of an undamaged blade to not cut straight when it should. The 4x6 metal cutting bandsaw mostly cuts work held in a vice and the cut can be markedly of...
Excellent, thankyou AC! That's exactly what I was after. Your answer squares with what I know about the way blades act, but turned my thinking on its head. Its not the leading, low tension edge that initiates the failure but the trailing high tension edge seeking to relieve excessive stress...
Thanks for the replies guys. I've googled LTB but all the calculations relate to I-beams or other sections not slender beams, and none feature any pre-tension. I was hoping one of you mech-guys would maybe have a formula that I could use.
I'm unclear on the mechanics of a pre-tensioned beam...
Hi all. My question relates to a bandsaw blade and its failure mode. Its a 1/2" wide x 0.025" thick blade, tensioned to a given stress level (30,000psi (about 250-300lbwt on the cross section left once teeth are ground in) for a bimetal blade or 20,000psi for a carbon steel FlexBack blade). The...
