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April 24, 2019, 12:41:50 pm
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B&I Gem Maker making a bad sound

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Author Topic: B&I Gem Maker making a bad sound  (Read 995 times)
mossagatemac
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« Reply #15 on: March 17, 2014, 10:15:11 am »

Quote
Am willing to pull mine apart and post photo's of the tear down if that will help-- everyone's mechanical skills vary so I will offer that to help.

Bryan, That would help a ton.  I've never done anything like this so even the advice you've given so far is a great help.  I can't express how much pictures would help!
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Isotelus
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« Reply #16 on: March 17, 2014, 04:46:23 pm »

Bear with me. Am pulling lights and tools together, never did a shoot of a tear down in the shop before. I will keep this as simple as possible I don't think you are in too bad a shape but we will see when we get inside.
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Bryan
mossagatemac
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« Reply #17 on: March 17, 2014, 08:45:02 pm »

I had some time tonight and might not later this week so I took a stab at it.  Thanks for the advice about the burr, you were spot on. 

Here are the photos.  I didn't see anything that was obviously wrong at this point (do you guys?).  Is the next step to pull out the brass looking things on the top/bottom?  Those are really tight and didn't budge so I wasn't sure if those should come out or not.  If yes, what's the best way to get those out?


* tear_down_1.jpg (50.24 KB, 653x490 - viewed 8 times.)

* tear_down_2.jpg (54.26 KB, 490x653 - viewed 2 times.)

* tear_down_3.jpg (63.54 KB, 490x653 - viewed 4 times.)

* tear_down_4.jpg (78.91 KB, 490x653 - viewed 5 times.)

* tear_down_5.jpg (44.91 KB, 490x653 - viewed 5 times.)

* tear_down_6.jpg (58.77 KB, 490x653 - viewed 7 times.)
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mossagatemac
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« Reply #18 on: March 17, 2014, 08:46:46 pm »

Here are the rest of the pics.  The last two are pictures of the brass thing that is stuck in there pretty good. 


* tear_down_7.jpg (40.49 KB, 490x653 - viewed 7 times.)

* tear_down_8.jpg (86.45 KB, 490x653 - viewed 23 times.)

* tear_down_9.jpg (48.82 KB, 490x653 - viewed 9 times.)
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dickb
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« Reply #19 on: March 17, 2014, 10:57:30 pm »

The second photo above shows the wear on the metal. If that is the bottom of the bowl just above the pulley. I would get a 5/8"inside dia x 1/8"thick oil bronze washer and try to install it before I take the bronze bushings out. That may stop the squealing from the pulley rubbing the bottom of the bowl. Just grease all the bearings and washer before reassembling the arbor and give it a try. There is probably more ware on the lower bushing due to v-belt tension than any on the top bushing. It is possible that there was a spacer between the bottom of the bowl and the pulley hub that is missing. When you  put the bronze washer on the shaft and slide the pulley back on. there must be some clearance between the pulley and the bottom of the bowl. You want the shaft to be tight enough that you can't push up on the pulley and the arbor rises in the bowl. If you don't understand what I'm telling you. Let me know what you are not sure about.

Dickb
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Elegance in Jewelry
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mossagatemac
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« Reply #20 on: March 18, 2014, 06:45:23 am »

Those pictures were of the top.  Here are the pictures of the bottom. 


* bottom_1.jpg (94.73 KB, 653x490 - viewed 3 times.)

* bottom_2.jpg (100.41 KB, 653x490 - viewed 5 times.)
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Isotelus
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« Reply #21 on: March 18, 2014, 06:54:11 am »

Good looks like it came apart easy. Thats good

Do you know if any grease appeared between the lower steel arbor flange and the top bronze bushing ? This is kind of important, sometimes there is dry grease in the bore between the upper and lower bushing that will not let new lube flow up to the upper bushing. Clean out the old grease in the space between the upper and lower bush, make yourself a little flag shaped thin plastic tool that will fit down the bore and scrape it out. The upper is the one that usually starves for grease partly gravity I think but you kind of have to make sure lube is getting up there, it's usually the upper one on mine.

The wear pattern on the shaft does not look too bad. Wipe out the top bushing with solvent and a cloth.

Neither of the original two equipment machines I have or any of the  second hand machines had a spacer washer between the pulley and the lower bronze bushing flange. That said it is not a bad idea, I have had to snug up the pulley to the bottom bushing to compensate for wear.
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Bryan
dickb
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« Reply #22 on: March 18, 2014, 08:53:00 am »

Photo doesn't indicate whether it was top or bottom. The bronze washer will work on top as well. I was looking at the chadder marks on the bearing surface and that is where your getting the noise from. The dried grease thing is a good thing to check as well.

You would need a special tool to remove the arbor bushings so it would have to most likely be done by a machine shop.

Dickb
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Elegance in Jewelry
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Isotelus
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« Reply #23 on: March 18, 2014, 01:50:57 pm »

Here are a few shots of the top bushing of my machine and some measurements


Top lip of bushing measures .125 Inch



* 017.JPG (45.52 KB, 600x450 - viewed 3 times.)

* 016.JPG (67.42 KB, 600x450 - viewed 7 times.)
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Bryan
dickb
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« Reply #24 on: March 18, 2014, 01:59:57 pm »

http://gemstone.smfforfree4.com/index.php?action=dlattach;topic=15708.0;attach=27662

Where is this photo from? I see the wear marks that I think are chadder marks where the metal has not been lubed and got hot. It it is the top of the bowl without the flange bearing installed the bearing may be ok.

Dickb
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Elegance in Jewelry
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GPAA, PLP - Blackhawk G&MC, CVR&MS
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Isotelus
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« Reply #25 on: March 18, 2014, 02:14:22 pm »

Bushing above from my machine .

Lip of bushing measures .125 inch thick

Bore of bushing measures .750

Shaft in Unworn areas measures .748 inch

Shaft measured in areas where bushing rides.747 inch

Overall length of bushing 1.00 inch

Bushing O D Under flange 1.00 inch

Flange OD 1.50 Inch
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Bryan
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« Reply #26 on: March 18, 2014, 02:16:42 pm »

Shaft of my B& I machine


* 011.JPG (68.91 KB, 600x450 - viewed 5 times.)
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Bryan
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« Reply #27 on: March 18, 2014, 02:23:15 pm »

Hi Dickb  The photo you were asking about is a top shot of mossagatemac's machine, I am not sure but this top bushing looks like it got worn almost to the aluminum arbor body. It might be grease, could sure use a side shot of that top bushing. I think it's worn badly.

I posted mine so we can compare photo's

The photo of the bushing with the grease zerk showing is the bottom of the tub mossagatemacs machine.
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Bryan
mossagatemac
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« Reply #28 on: March 18, 2014, 07:19:58 pm »

Here's a side picture of the top bushing.  I didn't remove them yet because they are in there pretty good.  The lip measures in at around 1/8th of an inch.  It looks this in the other picture because of the angle and part of it is painted gray. 

On the inside of the top bushing, i can see a spiral pattern which looks like it may be from a previous owner not taking the burr off prior to removing the shaft.  It goes the entire depth of the bushing and goes around the entire inside about once or twice from bottom to top. 


* tear_down_12.jpg (45.65 KB, 490x653 - viewed 4 times.)
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mossagatemac
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« Reply #29 on: March 18, 2014, 07:37:56 pm »

Actually, Bryan, after looking at the top picture of your bushing (pic 017) I think I can see a spiral groove in it similar to the one mine has.  Is that normal?  It's not the most high res picture so I might be mistaken.
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