Recent content by Tagger

I have an Italian drawing of a double end stud where in the material spec. has 10.9 UNI 3740. I assume the bolt should conform to Class 10.9. Can anyone steer me in the direction or give explanation for the Italian standard UNI 3740. Thanks!

I have a German drawing calling out a heat treament requirement. I think it is based on the Vickers scale. It is a large centering ring for a hub that helps keep a shaft centered while in the hub and the ID of the ring is hardened to resist wear. The drawing has 740 #40HV then beneath that it...

I am determining the the maximum effective and minimum actual tooth thickness for an external spline. The internal splines have a circular space width for maximum effective of 0.0876" and minimum effective of 0.0835". The P is 20/40 with 28 teeth and conform to the SAE side fit 37.5° pressure...

I did a little research and decided that 17-7 cannot get as hard as I would like. I am looking at Nickel based alloys.

As for Bar stock can 17-7PH SS be hardened to 55-60 Rc? Where can I find the strenghts based on the hardness? Components I haved designed around the spring need to be corrosion resistant, and as hard as possible. Precision Balls of 440C are being used in the design and I want the other...

I would be using the material for wire for a spring that needs to be corrosion resistant and handle temps. at times down to -50°F up to 200°F.

What would be a good material that is hardenable by heat treatment (up to 40 to +50C), corrosion resistant, and can handle subzero temps. down to -50°F (-46°C). I was looking at 440C SS but am concerned with the low temps. and becoming brittle. Is 440C rather ductile at -50°F? How about a nickle...

So what ya'll are saying is if there is 803,000 lbft^2 inertia acting on the shaft where I want to place a brake that is rotating at 756 RPM, then if I place the brake on the low speed side (282 RPM) then the inertia would increase to 803,000/((282/756)^2) = 5,771,130 lbft^2? That can't be...

I was at the understanding that the load inertia (lbft^2) is reduced or increased based on the gear ratio. Example: 10,000 lbft^2 at 756 RPM, the reflected load inertia on the low speed side of 282 (2.681 gear reduction) will give 26,810 lbft^2. But I have seen an equation where the reduction...

I am trying to find literature on large internal metric screw threads. Particularly M640 with a 8 pitch. Machinery's Handbook only goes up to 6 pitch for the tolerance grades 4 through 8. What literature is out there that will provide the tolerances for a pitch 8, and the min/max for the major...

I based it on a clean interface between the flanges. I read in Machinery's Handbook 0.8 in Mark's 10th edition page 3-23 it states "hard steel on hard steel dry 0.78", "mild steel on mild steel dry 0.74". If they were greasy OK .11, .15...I should design for worst case that there is some grease...

I am trying to confirm how to calculate the approximate torque capacity of a bolted flange. First you take the preload (P) that is generated by a bolt that is torqued to a certain amount. You then multiple P times the number of bolts in the bolt pattern to find the total preload. With the total...

Thanks for your help guys. I found some info from what a previous employee did using TK Solver that helps. Basically what I am determining is the torsional frequency of a vertical shaft for a pump. You not only have to worry about lateral frequency but also torsional. You have to determine the...

I need to calculate the torque capacity of an involute spline where the internal and external spline are shrink fitted together. Referencing the Machinery's Handbook (25th Ed) the major diameter of the external spline cannot exceed Ø25". I was using three formulas: Shear stress under roots of...

I understand about lateral vibration, but how do you calculate (formulas) for torsional vibration of a tube?[ponder]