Spindle strength test

What about a small sketch with dimensions? showing shaft diameter, hole location and diameter?

Sure ,By going to the link below, you will find a complete picture illustration.

You may need to copy and paste. Ok

Del

http://www.flickr.com/photos/organize/?start_tab=sets

sorry no yahoo account. some jpg would have been better. The problem is if the component is stressed, especially in fatigue, this hole will matter and the 10% overdesign will not help. best thing is to just do a stress analysis say by ANSYS and see the results.

Hello dellori3:

The thing you are planning to make is quite small in weight etc. Why not just 'over engineer' the thing by 10%? The hole you propose will be nowhere near 10% of the whole so it will be more than strong enough and will not have its or your integrity compromised.

stay safe

babybear

If you are taking an existing design and drilling it in an outer area, you may cause a problem but if you are starting with a new design, you should be able to guarantee minimal loss of strength if the hole is drilled straight down the middle of the spindle.

I learned to drive on a '63 Oldsmobile that had a hollow left front spindle with an attachment on the bearing cap for the speedometer cable. They designed it this way so that you could use any final drive ratio without changing the speedometer calibration. If you were spinning your wheels on snow or ice, the speedometer read "zero". These cars were noted for strength - the Oldsmobile engine had 18 head bolts on each head in a hexagonal array around each cylinder - this was back in the days when engineers designed cars rather than accountants.

Drilling down the middle of the spindle should result in the least reduction in strength.

Because the boat trailer would go on public highways you can't over emphasize the importance of safety. Our lives depend on properly designed parts being used on the roads.

If you can provide a detail drawing of the single component I may be able to model up a parametric solid and verify the strength of the part. This means we would need the material specification as well as all the anticipated stresses involved on this part. :How much weight (maximum with fuel) will the boat be?; What size of wheel will be used? (gives us rpm of spindle on highway, as well as cantalever stresses of wheel that is out of balance)

Remember, all of these details have to be taken as worst case scenario to design something that will be safe on our highways.

"They demand testing results etc.", as they should. Once the theoretical has been proven on paper, testing the component thru a independent third party will ensure approval of your design for the trailer. It all seems a bit over-the-top, but we want our childrens children to live another day.

Sensei

Hello AquaLungSensei:

you epitomise the kind of really helpful engineers on this site. Cheers. I am sure anyone would be pleased with your kind offer.

stay safe

babybear

I guess I should have been more clear on what the issue is.

By clicking on this web www.co-engineering.net then on "How it works" I think it will explain a lot more of the problem .

The passage is 7/64 by 1" long.and located on top of the spindle.

Where is the weak point of the spindle?

Del