Recent content by preload

Deserfox, I looked at the joint and did not find any step or signs of embedment other than the paint scratching off which is normal.

Desertfox, here is the link for the embedment test snaps. http://img521.imageshack.us/img521/7991/untitledps3.png Top 2 snaps are the 3/8 perimeter took to proof load bottom 1 is the 7/16 taken to proof load does these pics show any signs of embedment? sure we lost paint under the washer...

Dimjim, Yes the hole diameter increases uniformly from under head of the 7/16 bolt to the bottom. Under the head ID is 0.48 in and the ID of other side of the hole in the picture(3pf9) is 0.58 in. OD is 0.88 in. The depth of the hole in the gear case is 2.71 inch

Desertfox, Yes I can do some testing to see any embedding witness marks. I will do that on monday. Dimjim, I will get you the dimensions of that hole on monday for sure. Thanks a lot.

Desertfox, when u said bolt 2 and other side bolt would take the max external tensile load, are u sure about tensile load? I thought it would be more shear loading because the water flow or the water pressure is acting perpendicular to the bolts axis here right? regarding the tapered face, if...

Thanks Desertfox. Dimjim, All the surfaces(exhaust housing tapped holed surface, gear case bottom surface) are really flat (no raise) except for the 3/8 perimeter 4 bolts on the top side of gear case where the bolt head/washer lands. That surface is little raised and has a draft angle of less...

Dimjim&Desertfox, More pix before paint http://img254.imageshack.us/img254/118/untitledth3.png http://img386.imageshack.us/img386/3924/untitled2ik5.jpg http://img246.imageshack.us/img246/7451/untitled1nd5.png http://img112.imageshack.us/img112/7981/untitled3pf9.png

Yes I can get those pics before painting.I will do that tomm. Thanks

I can get the pics of gearcase upper and lower surface (before assy)tomm. I dont have my digicam with me today. Thanks Dimjim

Dimjim, http://img403.imageshack.us/img403/5969/exhuastlm3.jpg this is exhuast housing (tapped holes)

Dimjim, Thanks and reg the insufficient info, yes I agree it will be frustating for some one who is trying to help. Here are the pics of assembly for better understanding. I can get different angle pics if you need. http://img504.imageshack.us/img504/9900/view2vi6.png...

Cory, I am really sorry for long threads.As I mentioned earlier I am brand new to this fasteneing field (for short term projects) and was seeking help.I hate to be new. Thanks for understanding and helping.

Desertfox, I rechecked the number and I still got the same numbers. But still we are short of engagement length. Thanks for the helicoils suggestion.

Dimjim, Yes they are tested, but I need to rquest our supplier for the data. but even with 160ksi for a 3/8 bolt we are safe. I got LE of 0.68 in for 160ksi which is still less than our current le values for 3/8 bolts the problem is only with the 7/16 bolt regarding the LE

yup I agree, we will play with torque for sure. anyway I will et you know how consistent things show up after we do some experiments with dry bolts. and if we are consistently holding the clamp spec then we are good to go.