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lane
07-29-2008, 08:36 PM
I need a picthure of the hoist on your mill . for lifting motors. Thanks Lane

John Stevenson
07-30-2008, 04:13 AM
Here you are Lane.

http://www.stevenson-engineers.co.uk/files/Bridgycrane1.jpg

http://www.stevenson-engineers.co.uk/files/Bridgycrane2.jpg


http://www.stevenson-engineers.co.uk/files/bridgycrane3.jpg

This one is the second I made, the first one went on the big CNC and the idea was to have two swivels but only one head with trailer winch that swapped over.

I made a mistake with the first one in that it was over engineered and I fitted bearings to the swivel.

http://www.stevenson-engineers.co.uk/files/beavercrane1.jpg

The result is that it swings too free and won't stay where put.
The Bridgy one has a big nylon bush instead of bearings which cures all this.

.

small.planes
07-30-2008, 07:48 AM
John must have had a clearout, Im sure thats about 10 sq feet of floor I can see in photo 1 :eek: :D

Dave

pcarpenter
07-30-2008, 12:20 PM
Lane-- I suppose its not nice to ask this question, but given that you made a similar hoist arm yourself, why do you now want pictures of John's??:D

John-- thanks for re-posting the pictures. This is a neat and useful item you made. I saved one of your older postings of these photos or maybe from the site you linked once for future reference. I have all the raw materials, but just not the time. I really appreciate seeing the second one. I had grand plans to place my hydraulic press behind the lathe and perhaps fabricate a similar mount to the second one you show that could swing over the lathe-- mounted to the uprights on the press. My lathe is really fairly small (14" swing) and as such I should not need a crane to lift chucks off and on, but I am only 41 and already have back problems so perhaps I should be more realistic.

You mentioned before the mistake of using bearings for a pivot due to the fact that it wants to swing too readily. What did you use for a pivot on the one that works better? I presumed it was just two pieces of tubing sized such that one is a nested fit inside the other.

Paul

Lew Hartswick
07-30-2008, 06:12 PM
Thanks John. I may get a chance to make one for the school shop
this winter to handle the "monster" rotary table. :-)
...lew...

lane
07-30-2008, 06:33 PM
Thanks again John.

Pcarpenter no mine did not brake. But i did not see johns till after I built mine . A buddy wants to build something for his mill and we talked about it and I think john had a better design . Mine I copied a Sky hook design. Besides I may build another one with another arm added .

PaulT
07-30-2008, 08:33 PM
Geez John (now this is just friendly kidding), weren't you in an earlier post dumping all over the deficiencies of Bridgeport mills, now in this post the first mill you show is a ... BRIDGEPORT!!!

I know, like me you love to hate them.

Paul T.

John Stevenson
07-30-2008, 08:45 PM
Yes but you can see where it's situated and getting this out to replace it with a decent mill isn't worth the lost time.
Since that picture was taken I have shoehorned another full sized CNC in between the Bridgy and the Beaver.

.

PaulT
07-30-2008, 08:56 PM
Yes but you can see where it's situated and getting this out to replace it with a decent mill isn't worth the lost time.


Ouch, why did I have to set myself up for that.

Actually what's really funny (and sad) is I don't even have a real Bridgeport, I'm one of those guys wishing that someday I might have a real one, both of mine are chinese clones (the horror, the horror).

Paul T.