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We normally specify spur and helical gears with 2.35M whole depth and 2.0M working depth to allow for grinding and shaving if necessary. We have a supplier who is proposing to change whole depth to 2.25M to suit their standard hobs. Everything else: working depth, centre distance, rack shift...

Thanks Gearcutter, that's very good info.

PJM - that looks exactly like what we are looking for! Do you have a source for the photo? And possibly even a reference for the standard (if any) to which they were manufactured or alternatively a reference to the manufacturer of the gears? tbuelna - unfortunately a helical arrangement is...

No, this isn't a dog clutch, but a normal spline with tapered-out ends. See attached below for a schematic (which exaggerates the taper).http://files.engineering.com/getfile.aspx?folder=fd8fc389-4e53-461d-91a0-f72126095ccc&file=Keystone_spline_exaggerated_detail.pdf

I am trying to specify a "keystone" taper on a cylindrical spline, i.e. to have the male and female splines be cylindrical in cross-section, but to have the tooth thickness on the male, and space width on the female, increase linearly along the axis. The application is a female selector which...

Thanks a lot, I was having great difficulty tracking this down.

We have a steering box with the input spline specified as 1" x 79 serrations per ZGN 715. I have found the dimensions of this on a Nadella shaft catalogue, but I am looking for a mating female part. Can anyone advise: Dimension of a female 1"x79 ZGN 715 spline? Who issues ZGN 715? I can't...

Thanks TVP; that was exactly what I was looking for.

We are looking to use a bronze bushing in a vehicle differential planet gear (i.e. high-load, low speed, oil lubrication). We are looking at either Al Bronze CC333G = C955000 or a phosphor bronze. We are getting different values for a recommended max bearing pressure depending on where we look...

One issue with 6x6 -v- 8x8 is that, in order to evenly distribute the axle loads, CG has to be towards the rear, i.e closer to the rear bogie. This forces the CG height up relative to an 8x8 where the CG is pretty much in the middle and can be lower down because payload can fit in the gap...

Hi geesamand. Yes we did have to change the oil spec because of pour point and I never posted to this thread. Shell recommended Donax TD Low Vis which is a tractor oil with a pour point of -51C

Thanks everyone. No, we didn't specify ATF - we told them to use a low-temp gear oil e.g. 75W-90 rather than our usual 80W-90. FWIW, the general advice I've got elsewhere is also that it shouldn't be a problem for the gears, but we'll see...

A customer intends testing a vehicle of ours after conditioning it to -46 C (-50F). The vehicle has an axle and hub reduction which use case-carburized 8620 and 4820 gears. Does anyone have any experience of operation of such gears at these kind of temperatures? Obviously after a few minutes...

Hi, I am looking for Strain-Life or failing that Stress-Life fatigue coefficients for the above steel plate. My usual sources (ASM Handbook Vol 19 and the ASM "Atlas of Fatigue Curves") don't seem to have it. Can anyone help?

Thanks. Of course it's the usual problem of how close it has to be to be "equivalent" without giving the supplier too much latitude. I was actually looking at ASTM A958 SC8620 and up before I read your post, which is probably the closest in chemical comp, but 8620 wouldn't have the strength...

I'm looking for a US equivalent of the above for spec'ing purposes, but it doesn't seem to exist. Some places give ASTM A487 Grade 6 as an equivalent but there are a number of problems with that: The ASTM grade has a lower yield (655 compared to 700 MPa) The ASTM grade has a huge permissible...

Quick Question - does the Woodhead damper company still exist? We dealt with them about 15 years ago but I can't find them on the web now. I think they may have been merged with/taken over by someone else (maybe General Kinetics?). Any clues much appreciated.

Thanks for all the comments. For Info: the part in the photograph is a SAE4340 (BS970 817M40) tube which was screwed into a cap of identical material. No glass beads or other blasting was used. The interior of the tube (i.e. not the threads) was treated with a phosphating-type treatment. The...

Is there a good or even foolproof way to determine whether a threaded joint has been damaged by cross-threading (bad assembly) -v- binding (bad manufacturing tolerancing or gauges). We believe the attached are caused by binding - if it were cross threaded the damage should be at the start of...

Do you have a good text or reference for Amboid and Hypoid Gear Design that I could read up on? Most of what I can find on the web is either lubrication info or people modifying passenger cars. We are interested in using amboid or hypoid designs for offroad trucks. At the moment we use spiral...