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View Full Version : Will these bunk lift brackets be strong enough???


jdeml
08-15-2012, 05:51 PM
I wanted to post in the general section only because I need some answers and fast. Basically the brackets that were sent with my lift were too small so I made some out of 6061 aluminum T6 that will give me my clearance needed (about 17"). The pictures show how the front and back are mounted to the I-beam with 5/8" Bolts. The front is 2 pieces of angle aluiminum bolted with one bolt resting on I-beam and one underneath the Ibeam. The back is supported by (1) angle aluminum and (1) flat bar aluminum, (had to for clearance ssues). The angle aluminum is 3/8" thick and the flat bar just used in the back is 3/4" thick. I have read that it will be fine and that it will break. Only problem is my 2004 XStar is sitting on it now. I dont want to chance anything expecially if a storm comes in and it gets to swaying and they break (Worst nightmare...really.) Can anyone tell meif Im good or not?

82962

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JR8778
08-15-2012, 11:37 PM
That is what mine look like.

2RLAKE
08-16-2012, 07:26 AM
its been 20 years since i used my engineering degree for load calculations ... lateral and torsional loads will be the challenge

jdeml
08-16-2012, 10:44 AM
its been 20 years since i used my engineering degree for load calculations ... lateral and torsional loads will be the challenge

Thats what Im thinking. Was hoping someone would chime in saying " Yeah mine are that high and thinner and work just fine." I see alot of square tubing and channel and makes me wonder if mine are just flat bar and angle.

kyfooter
08-16-2012, 12:23 PM
If you have to ask, don't you already know the answer? Anytime I've found myself asking for re-assurance, I already know the answer in my heart...build it bigger, stronger, etc.

When it comes to our boats (babies), is there such thing as overkill in terms of making sure the dock, lift, etc. is rock solid?

jdeml
08-16-2012, 03:15 PM
[QUOTE=kyfooter;868900]If you have to ask, don't you already know the answer? Anytime I've found myself asking for re-assurance, I already know the answer in my heart...build it bigger, stronger, etc.

When it comes to our boats (babies), is there such thing as overkill in terms of making sure the dock, lift, etc. is rock solid?[/QUO

You shoud see the brackets it came with, 1/4 flat bar. I went overkill I thought and then looking around at all the different set ups alot of people had channel and Square tubing. I think itll be fine (fingers crossed) lol

east tx skier
08-16-2012, 09:30 PM
You'll be fine.

https://lh6.googleusercontent.com/-70GOsTspUyM/TBo_jpRBTGI/AAAAAAAADAA/LSrf3J0GSes/s600/Boat%2520on%2520Lift.jpg

https://lh4.googleusercontent.com/-GGYqvJOW9cw/T30NPP2ahiI/AAAAAAAAE50/bsPlndgaffM/s800/IMG_4264.JPG

tideengineer
08-16-2012, 09:37 PM
Man those angles are strong....like miniature columns and can take lots of load.

epnault
08-16-2012, 09:43 PM
Please, someone whip out a free body diagram :)