Some induction hardening trials have been carried out for me using specimins made in C45 steel. In production however, the material I will use will be 42CrMo4. Unfortunately the C45 tests have produced hardening depths that are just a little under specification.
So, what do you think... will...
I have a large and heavy piece of industrial equipment that is rotated into different angular positions via a 2m dia gear ring. The gear-ring is driven by the output pinions of six electric motor powered gear units positioned around it.
The system works well under power because the six...
Hi,
I dont know whether I'm in the right forum here, but if not perhaps someone can redirect me to a more appropropriate place....but in the meantime...
I would like some advice on how to measure without contact, to an accuracy of about 0.050mm, the distance of a machined spot near the...
The ancient clock makers process of 'roller burnishing' appears to be making a bit of a come-back as a low cost way of creating a good surface finish together with some superficial work-hardening of the work piece.
Does anyone know if the process is as effective as it claims to be and how one...
Can anyone advise me on the ideal and expected surface and core hardnesses for bearing quality balls of 64mm diameter made from 100Cr6 and 100CrMn6 ?
Am I right in believing that the 100CrMn6 would give a more uniform hardness and therefore less internal residual stress ?
Does any one here have experience of crush testing of large bearing balls ?
1) Im setting up a specification for the purchase of large (say 50~70mm) carbon chrome steel balls and want to include a strength test. I see some ball manufacturers qualify the strength of their products using a 2...
Most rolling element bearing manufacturers set limits for the maximum section thickness of rings made from 100cr6 material. This is usually around 15~20mm. For section thicknesses above this, they tend to make their rings from a higher hardenability steel, such as 100CrMn6.
Somewhat strangely...
Hi,
I want to do some fatigue calculations on a structure. Does anyone know where I can find a Wohler or SN curve for the material 42CrMo4 in the Q+T condition? I have done some google searches but nothing comes up. Any help would be appreciated.
Im looking for an anaerobic adhesive that will work well on silicone rubber. Ive tried one that works extremely well on nitrile, but it didn't seem to want to stick at all to the silicone. Do I need a special type ? Any help would be appreciated.
Gerry
Does any one have an intimate knowledge of the greases that are currently used in cv joints ? I would guess they are generally special formulations and so the manufacturers wont be giving out details.
I think cvj greases will perform well in a completely unconnected application which has...
A while ago I did some comparison tests on the corrosion resisting ability of some popular 2 stroke oils. The winner, Castrol TTS, was quite unexpected. It is a high performance fully synthetic (PAO) type, and when designed, building in corrosion protection would have been well down on the list...
Does anyone know if there is a relationship between fretting corrosion and contact pressure in two microscopically sliding oscillating surfaces ?
I am trying to establish some load limits for ball bearings where there is a tendency to 'false brinell' due to load fluctuations when the brg is...
Generally it is accepted that if one maintains an adequate ehl film in a rolling brg, the eventual failure will be one of subsurface fatigue due to crack propagation from partical contamination in the steel. Conventional thinking also says that if the ehl is reduced, or contaminents introduced...
I have a difficult bolting application that might be solved by the use of an open ended slogging spanner. The nuts to be tightened are M36. Does anyone have an approximate feel for the amount of torque that could be applied by such a tool ?
Clearly it alot depends on how hard you can hit the...
I am getting involved in discussions between the manufacturers of a slewing ring bearing with internal gear, and the drive pinion gear supplier. They have used the terms -
'addendum reduction',
'addendum modification'
'tip relief'
Can anyone please explain the relationship or the meaning of...
A supplier has recommended that we change from plastic spacers to steel band type cages on the large pitch control bearings of wind turbines. He argues longevity as the reason but there has been no evidence of deterioration of the current plastic parts. The bearings run cold and the greases used...
Does anyone know what kind of anti-corrosion additives are used in two stroke oils, if at all ? Unfortunately this is a subject which the manufacturers are reluctant to discuss openly.
Ive recently compared the ability of a few oils to prevent corrosion and find it varies significantly between...
I have recently been shown raceway/ball surfaces inside a slewing ring bearing which had supporting a blade of a large wind turbine for around 6 months.
The raceway surfaces showed the usual zones of fretting where the balls had spent most of their time. In addition to this, around approx 1/4...
Im just starting to investigate the technology of bolted joints and have come across the term 'set' or 'embedment'. The literature I have suggests that this phenomena, which is caused by a crushing/collapse of the contact surface asperities etc, tends to reduce preload built into the joint. It...
The flanges on the tower sections in a large horizontal axis wind turbine are joined by a hundred or so large bolts.
The bolt heads are all marked with three things:-
a)makers names (Nedloy and Friedberg)
b) the nos. 10.9
c) and the letters HV
I believe '10.9' is basically the strength but can...
