Recent content by scarecrow55

I want to make a small guard for a trailer attachment that might experience artic temperatures -40 degs C. Will EN14 150M19 bar be OK for this or could it suffer brittle fracture. What would be an easily obtainable British alternative. Thanks in advance.

The tooth of the bevel will taper towards the centre. The inspection/gear data is taken on the PCD. Your best bet is to ask this in the 3D drawing forum. If the cut could have something like a draft to it then that might work.

I don't do FEA, I'm only interested. Why in Cosmosworks Pro when you hit the study icon should the full list (freqency etc) flash up but then only show static. There are no drop down arrows that I saw to be able to obtain frequency.

I'm using 2007 2.2 and all mates are OK on my system. I assume you mean the actual text in the mate selection box?

In Cosmosworks Professional when you click study, you get an icon that says static. How do you get frequency. I thought all the icons popped up not just static.

I don't know where you are but here in England I tried to grind a piece off and found it extremely hard steel - my question would be will it weld OK

You must slow the thing right down & take the load off to avoid any damage, put chamfers on the teeth ends to start with. I suppose a gear ring bonded by rubber to a central hub might take out a bit of shock but I reckon without somesort of syncromesh unit you won't avoid shock.

Yes it is welded but I have the correct welding procedure/wire . It was originally made from plate EN10025 S275 K2G3G4

I'm making a handle from 20 square hollow tube that might be used in low temps -40C. Ordinary MS would suffice for the stresses but what spec would I need for the cold snaps (excuse the pun). 43D EE ? Anybody help? UK spec preferred

I'd agree with eromlignod. They might feel OK by hand turning but under load they'd get destroyed.

The smaller PA will be quieter as the contact ratio is increased, however they are relatively weaker (offset maybe by the larger contactact ratio) 20 is the industry standard, 14.5 may cost more or be harder to get.

FEEDBACK I torqued 3 bolts into the casting with the thread length as calculated in my opening post and all three failed by tensile failure of the bolt at the torque figure that would load the bolt to yield ( it kept giving until the bolt broke). So the calcs seem OK for that particular...

I'm utilising , & need, the full tension & recomended torque by Unbrako for this bolt. This will give me a SF of about 1.3 on slip between the joint. I think that will bring the bolt stress to near 0.75 Yield. I'm going to do some pull tests today to see what fails first.

Thanks Guys. Dimjim I used a formulae from http://www.roymech.co.uk/Useful_Tables/Screws/Thread_Calcs.html I've seen the same one elsewhere, it could have been Machinery's

I have a hi strength bolt (12.9) going into a cast steel body - (no I can't change it), if I work out the engagement length based on the relative UTS of the materials I get a factor of 2.4 x the engagement length of the correct "nut" so I can tighten it right up. All well & good but surely there...