| Engine hoist main beam sizing [message #353129] |
Wed, 25 March 2020 16:08  |
Ty Hardiman
Messages: 43
Registered: April 2017
Location: Norman, Oklahoma
Karma:
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During this down time I would like to get with my welder and build a hoist & trolley for an "out-the-top" engine removal. I've done a lot of research on the GMCMH photos page, and there are lots of great ideas there. I have some questions about the main beam sizing and I know we have quite a few engineers and experienced people on the GMCnet. I don't want to undersize the main beam but I also don't want it to weigh more than necessary from being oversized. I know my way around lumber but I'm lost when it comes to calculations involving things like "bending moment", "moment of inertia", and "modulus of elasticity". Maybe someone can run a calculation or at least give me real world knowledge.
1. I'm assuming a 144" length with a 700lb engine weight, no more than 100lb beam weight, and an L/360 deflection limit. Are these good numbers? What would be an appropriate safety factor?
2. Is there an advantage between an S or W beams or hollow structural sections (HSS) in terms of weight or any other criteria? Flange beam trolleys seem readily available at HF or Northern Tool, whereas on the GMCMHphoto page it looks like people using HSS beams have made their own trolley.
3. And based on the choice between S, W, or HSS beams, what is the appropriate size & thickness to use?
Thanks all in advance.
Ty
Norman, OK / August 1977 Kingsley / 403 / 3.55 / 16" / Quadrajet
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