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Re: [PSUBS-MAILIST] CT ring surface not true.

Dan H and Hugh
Thanks for the sketch and ideas I'm looking forward to building the tool.I allso have a dial indicator
Glen
----- Original Message -----
From: Dan H.
Sent: Sunday, March 13, 2011 4:39 PM
Subject: Re: [PSUBS-MAILIST] CT ring surface not true.

Basically I agree with your sketch Hugh but I would replace your flat arrangement with a center shaft and crank arm.
 
When I made a similar rig, I used a long shaft instead of your "lazy Susan."  With a Lazy Susan type design you are counting on the outer bearing being perfectly flat to control the grinding depth.  I would replace the upper half of you rig with a long vertical shaft that has an arm on its top to hold the grinder.  Instead of a small center bearing and a large out bearing, I would use a center bearing of maybe two inch ID and a to inch shaft that is long enough to mate with a second two inch bearing mounted down in the hull.  You need to get a few feet of distance between the two bearings.  That way your grinder will run true to the center line of your top and bottom bearings and not be affected by any deflection of such a large and VERY EXPENSIVE outer bearing. 
 
Dan H.
 
 
 
 
----- Original Message -----
Sent: Friday, March 11, 2011 4:35 PM
Subject: RE: [PSUBS-MAILIST] CT ring surface not true.

Glen, I concede, I would go with Dan?s method myself but thought that lazy Susan is an option.  Best to go with what someone has done previously.  Ask Dan for a sketch as I found it a bit hard to visualize.  Beg borrow or steal a Dial indicator to set up,  also use a cup grinding wheel.  Good luck,  Hugh  

 

 

 

 

 

 

 

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan H.
Sent: Saturday, 12 March 2011 3:04 a.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] CT ring surface not true.

 

Glen,

 

Hugh's way is what I would use.  I've done similar jobs in the past. 

 

One twist to his description I'd consider is, instead of a "lazy Susan" type setup, you may find it easier to make a spider top mount with a flange block bearing in its center to go in the coning tower and a second flange block to tack weld at the bottom of your hull inside the sub a few inches off the deck.  Then use a shaft of the appropriate size and length to go between them with a swing arm to hold your grinder on it's top.  It will be easy to mount your rig in the center of the conning tower than locate your bottom bearing so your grinder swings parallel to your flange face.  For simple height adjustment you can wedge under the shaft or use a nut and bolt mounted under your bottom pillow block as a simple screw jack to set your grinding depth. 

 

Dan H.

----- Original Message -----

From: Glen Brown

Sent: Thursday, March 10, 2011 3:32 PM

Subject: Re: [PSUBS-MAILIST] CT ring surface not true.

 

Hugh,sounds good seeing I have 3 bench grinders and quite keen to fix the ring myself ,the ring is allso 4mm thicker than called for by the plans for this very reason.I wonder if the  opposite bottom of the ring could allso be used as a guide possibly with rollers.Love to see your sketch.By the way after welding the ring on to the ct I faced it in a large lathe mating it with the hatch cover ring.

Glen

----- Original Message -----

From: Hugh Fulton

Sent: Thursday, March 10, 2011 9:49 PM

Subject: RE: [PSUBS-MAILIST] CT ring surface not true.

 

Glen, there are many portable flange surfacing machines around that do onsite work and wont cost much.  Other than that you will have to find someone with a large horizontal borer and take it to their shop.

IF you want to do it yourself use a bench grinder with cup wheel mounted on an angle plate which is mounted between nuts on studs on a round plate and get a good quality ?Lazy suzy? bearing between two steel discs.  Bottom disc should have nuts welded in 4 places 90 degrees so you can screw jacking bolts against the inside of the ring or conning tower depending on dimensions.   IF you like the idea then we can do a sketch.  Grinder will only do about 0.1mm per rev.  Depends on where you are, resources etc.  Always remember there are always minimum of 3 ways you should consider to solve any problem.   Hugh

 

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Glen Brown
Sent: Friday, 11 March 2011 3:49 a.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] CT ring surface not true.

 

Hi All

I need Idea's to get my ct ring surface to mate with my hatch ring as it has warped by + -  2mm in the welding

process.

Thanks Glen

 



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