[PSUBS-MAILIST] Gantry lift

[Alan James]

Do you have a problem with your neighbours Douglas?
You could have fun with that in the keys, firing it out to sea.
Alan


________________________________
 From: Douglas Suhr <spiritofcalypso at gmail.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Thursday, April 3, 2014 5:25 PM
Subject: Re: [PSUBS-MAILIST] Gantry lift
 


Scott, you probably won't find this little story of significant relevance or importance in your case, but... 

I've been working on a cannon project for the last few years (on and off) building a civil war siege mortar with an 8 inch bore, but that uses the carriage design of the 13" seacoast mortar. The barrel weighs in at exactly 1012 lbs. and the base at around 1300 lbs. for a total of well over a ton. Our tractor won't lift that much, so dad and I found ourselves building a gantry on the cheap! 

Mobility wasn't much of an issue for us because all we needed to do was lift up and set down on the deck of a flatbed after we backed it under the gun. So we built two stanchions from 10 foot 6X6's and spanned them 10 feet across with a 4X6 box channel 3/8" thick. We bought steel end caps for the 6X6 stanchions (to keep them from splitting) and put a tripod like leg arrangement on each stanchion for stability. To keep the beam from falling off the top of the stanchions we screwed a piece of wood into either side of the top of each leg that stuck up past the beam to sandwich it in. We wrapped a chain around the middle of the box channel and hooked a cheapie "2-ton" hoist onto the chain. BANG! Done for under $500. It worked in a pinch but I put the 2-ton in quotes because 1 ton was almost too much for this cheapie chinese thing. We have since upgraded to a true 2-ton hoist that I got off a friend of mine. Our cheapie hoist would occasionally "slip" and
 even if you weren't having a picnic under the mortar it was still nerve racking. Point being: splurge on a really nice hoist. ~ Douglas S.       



On Wed, Apr 2, 2014 at 5:53 PM, swaters <swaters at waters-ks.com> wrote:

I didn't think of that. I will put down some plate steel.
>Thanks,
>Scott Waters
>
>
>
>
>
>
>
>
>Sent from my U.S. Cellular© Smartphone
>
>JimToddPsub at aol.com wrote:
>
>Scott,
>It just occurred to me that the load bearing capacity of your 
floor slab needs to be considered as well.  Each of the four wheels of the 
gantry has a contact area of not much more than 1 sq. in.  You 
might need to put something down over the area where the gantry will be when 
it's under load in order to spread the load out.  Otherwise you might end 
up with a cracked floor.  It might be a needless concern, but 
I've seen several instances where slabs have been cracked and 
distorted.
>Jim
> 
>In a message dated 4/2/2014 11:37:57 A.M. Central Daylight Time, swaters at waters-ks.com writes:
>Haha. Good advice Alec. I just bought the 5 ton one from Harbor freight.  I'll get my wife Katy to put it up for me. She works out. Haha.
>>Thanks,
>>Scott Waters
>>
>>
>>
>>
>>
>>
>>
>>
>>Sent from my U.S. Cellular©  Smartphone
>>Alec Smyth <alecsmyth at gmail.com> wrote:
>>
>>The one that broke was a 2 ton Harbor Freight. I now use a 3 ton  and its been fine. They also have a 5 ton, which I would suggest for a K350.  These things are cheap and there is little price difference between them, but  the're really heavy and I like taking the hoist down when not needed, to get  all the chain out of the way. If you use a 5 ton, you will probably want to  leave it in place because it weights about 80 lbs. I can reach up with the 3  ton hoist and click it onto the crane, but it weighs 50 lbs so is getting near  my limit. Which all goes to prove that if you have a K350 instead of a K250,  you'll have to spend more time at the gym. 
>>
>>
>>Best,
>>
>>Alec
>>
>>
>>
>>On Wed, Apr 2, 2014 at 9:40 AM, swaters <swaters at waters-ks.com> wrote:
>>
>>Ok. Cool. Thanks Steve. Alec, what was the hoist you had that broke on  you?
>>>Thanks,
>>>Scott Waters
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>Sent from my U.S. Cellular©  Smartphone
>>>
>>>Steve McQueen <psub101 at indy.rr.com>  wrote:
>>>
>>>Scott, I just bought a generic trolley and hoist (Harbor Freight). The  trolley needs to fit your beam size (mine was adjustable) and I chose  ratings over what I expected. 
>>>
>>> I didn't considered an electric 
    vs. manual hoist at the time but you might add that to your 
    considerations.
>>>
>>>Steve
>>>
>>>
>>>
>>>
>>>On Tue, Apr 1, 2014 at 2:53 PM, <swaters at waters-ks.com> wrote:
>>>
>>>I just purchased a gantry lift on craigslist in Texas. It doesn't  have a trolley or chain hoist though. I started looking on the internet  and there is a huge range of trolleys and chain hoists. Does anyone have a  suggestion what to get and where to get it?
>>>> 
>>>>Thanks,
>>>>Scott  Waters 
>>>>_______________________________________________
>>>>Personal_Submersibles 
      mailing list
>>>>Personal_Submersibles at psubs.org
>>>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>>
>>>>
>>>
>>>_______________________________________________
>>>Personal_Submersibles 
    mailing list
>>>Personal_Submersibles at psubs.org
>>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
>>
>>
>>_______________________________________________
>>Personal_Submersibles 
  mailing 
  list
>>Personal_Submersibles at psubs.org
>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>_______________________________________________
>Personal_Submersibles mailing list
>Personal_Submersibles at psubs.org
>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>


_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140403/bb4ecb38/attachment-0001.html>