Reference dimension means no tolerance. The dimension is given only as a reference. For example: if you design a spring you give the active number of coils as a reference for the spring manufacturer so he can know how you calculated the spring but, he can play a little bit with actual active...
We encountered an odd behavior of a shaft rotating on two full complement cap drawn needle bearings that in addition to pure rotation of the shaft, the shaft advances along it's axis in a "screw like" movement. The bearings were manufactured by a well known respected American bearing...
Does anyone know why DOD-L-85645A LUBRICANT, DRY FILM, MOLECULAR BONDED was deactivated for new design more than 10 years ago? Is there a new process to replace it? This process called "dicronite" www.dicronite.com and there are other companies who has similar product.
DOD-L-85645A1 LUBRICANT, DRY FILM, MOLECULAR BONDED was inactivated on 1994 and 2000 for new designs. Is there a new process to replace it? Does anyone has an idea for the reason/s it was inactivated for new designs?
I have an 4340 steel part heat treated to 160-180 ksi but locally on small area it has a hard case 60-65 RC (flame or induction hardening). I would like to zinc coat it except the hard case area. What is the common way to mask/protect the hard cased area from hydrogen penetration during the zinc...
I prefer to use QQ-Z-325C to specify thin coatings Type II Class 3 because it specify 36 hours of salt spray compared to 12 or less according to ASTM B633.
Although QQ-C-325 is obsolete many plating houses and companies such as Moog continue to use it.
I have a debate with QA and they use the...
Looking for documented data of the magnetic properties variation (tolerances) of the B-H curve for commercial low carbon alloys such as AISI 1010, 1018, 1020 and AISI 12L14, 1113, 1117 etc.
We could not release the 0.3 module injected plastic gears from the mold without destroying the gears. It seems that the gear teeth in the undercut area (quite large undercut) shrinked and the force needed to release the gear is too high.
Does anyone familiar with releasing difficulties of...
I am looking for the formulas for the design and analysis of non-circular compression spring similar to the retention springs used in fire arms bullet magazines. I could not find any information in common spring design books such as from Wahl, Chironis, Berry, SPEC etc. I can develop the...
Does anyone have a comparable prices per lb between low carbon alloys such as AISI 1010, 1020 compared to Permedur 49 or Hiperco 50 3" to 4" diameter bars. I do not need exact prices but a rough comparison.
What will be the maximum section thickness to harden and temper 416 to 34-48 RC.
What is the maximum bar diameter for AISI 416H per ASTM-A-582 (pre hardened bars to 34-48RC)
Does any one have any good or bad experience thoughts and knowledge of precision spur gears (AGMA Q10C) made of Titanium such as 6AL-4V or any 334-38 RC titanium alloy?
Any information will be appreciated.
We have Custom 465 parts heat treated to H-950. Then wire EDM cut in few places. When loaded the part break into many pieces, in a very brittle fracture. We suspect hydrogen embrittlement although there whs no checmical cleaning, pickling, or passivation. After baking another part in an oven for...
Looking for off the shelf honeycomb plates made of paper, aluminum etc,. that can be used for impact attenuatation based on the cruchable stress of the honeycomb.
I am looking for specific sliding calculation formulations for external pinion meshed with an internal gear. First when the pinion is the driver and second when the internal gear is the driver.
Any information regarding a book/artice that has the formulation and theory for this case willl be...
From some reason when I key mathcad operators such as the colon-equal (:=) or just the equal sign, etc. I see pictures such as disk pictures instead of the :=. I assume it is probably happened due to an installation of a new program that changed files in the Windows 2000 professional system...
Is there a reference publication that gives the design formulas of the canted coil spring (as featured in the Bal Seal Co.). I am interested in the design formulas that calculates forces, deflections and stresses as a function of the coil diamter, wire diameter, number of coiles canted angle etc.
