All power mowers should be outlawed and replaced with manual push mowers. I find it irritating when I see an obese person driving a oversized, poorly tuned tractor/mower around a quarter acre lot.
Our company has an equipment supplier based in Germany whose designs and processes conform to EN 729. Our equipment must comply with the requirements of AWS D1.1. Can anyone let me know if there are substantial differences between these two standards? I am looking for a quick and easily...
Knowing the torque applied to the worm gear, how would I calculate the amount of resistance torque must be applied to prevent backdriving of the worm and motor shaft? I need to size a motor brake to hold the applied torque.
The allowable shear stress for fillet welds on non-tubular steel structures in AWS D1:1 Table 2.2 is .30 x filler tensile strength. Since this is an allowable value for buildings I presume there is a factor of safety inherent in this formula. Does anyone know what factor of safety is applied...
Check out ANSI A10.4 and A10.8. In suspended scaffolding design the factor of safety is based on the hoist's rated capacity, not the design load. The hoist's rated capacity must be less than 1/3 of the stall load or cut-off load of the hoist. On a multi-layer drum hoist the load the hoist can...
My was built in 1948 in Tacoma, Washington. When I purchased it I had to tear down an existing outdoor deck and stairs which uncovered a crack in the foundation that starts at a doorway and extends down to the footing. The crack is about 3/8" wide, and the adjacent corner of the house has...
I would recommend "Industrial Noise and Vibration Control" by J.D. Irwin and E.R. Graf or a similar text. You should learn a little about sound and how it's "properties" are quantified before you go too far. Noise control situations involve either isolation of a noise...
1926.552(b)(8) requires material hoists to conform to ANSI A10.5-1969, Safety Requirements for Material Hoists. I have not read a copy of this, so I am not sure whether or not a factor of safety for the component you are designing is mentioned or not.
For specific design applications try the catalogs from some vibration isolator companies such as Barry Controls, etc. You can locate them through Thomas Register.
