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Post by akansan on Oct 18, 2008 12:51:04 GMT -5
So, I was planning on swapping out the multiple expando drums on my second arbor set up and replacing them with Nova wheels. I purchased the wheels and went to set them up - took off the expandos, got the bushings in place...only to discover that I have a very unique shaft on that arbor, designed for the 1/2" center widths of expando drums.
The center of the shaft, where it passes through the bearings, is 1". About 2 inches on either side of the bearings, it's turned down to 3/4", with a smooth section for about an inch and then it's threaded for another inch. After the threading...it steps down just a hair. Not all the way to 5/8", but enough that the 3/4" bushing is too big. It goes at that not 3/4", not 5/8" size for another 4 inches before it turns down to 1/2"...and there's where my problem lies. It's only smooth for 1/2" there, and then threaded for only 3/4" before the shaft ends. A Nova wheel is 1 1/2" wide. So I can get two of the wheels in place at the inside positions, but the outer positions will only hold something at most 3/4" wide (leaving 1/2" of threading visible for the nut).
So, do I need to go looking for another shaft? If I wanted the 1/2" turned down area expanded so I could get the wheel on, what type of person/shop do I need? Or is that not possible once it's already been turned? And if I need to go looking for another shaft, where do I look?
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Post by deb193redux on Oct 18, 2008 19:08:47 GMT -5
A machine shop is what would turn it down. Likely you would incur an hourly rate of $60/$70.
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Post by Woodyrock on Oct 19, 2008 1:30:26 GMT -5
If your bearings are one inch, you would end up with a better machine by replacing your shaft with a new one inch shaft. The machine work to have a length of shafting threaded both ends one lefthand, and one right hand would be less than having your existing shaft sleeved, and turned. You might be able to find a made up shaft the length you need for less than having one made. Then, however a damsel in distress can often get a simple job done for for less than one of us guys just by smiling at the the machinist. Look for a small machine shop....and you are in the right part of the country to find small machine shops that cater to farmers. Sometimes you need to have the nuts so they can match the threding, especially the lefthand one. Woody
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garrett
having dreams about rocks
Member since August 2008
Posts: 62
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Post by garrett on Oct 19, 2008 4:48:42 GMT -5
Woody,
You mean to tell me an overweight baldheaded old man can’t get a good deal in Washing State? Maybe I’m fixen’ to move to the wrong state.
Garrett
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Post by bobby1 on Oct 19, 2008 9:46:49 GMT -5
If I put on some lipstick could I get a better deal? I think I'll go to my local machinist and give it a try. It works on some animals I've heard. Bob
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Post by akansan on Oct 19, 2008 11:22:16 GMT -5
So looking for a new shaft would be the better answer all around - cost and final product-wise is what I'm hearing? I'm guessing machine shops would also have the 1" round stock or do I need to look for that first?
Bobby - you'll have to let us know how that turns out.
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Post by Woodyrock on Oct 20, 2008 10:07:53 GMT -5
Kansas girl: The new shaft would be the best all around deal for what you need. Machine shops carry stock, and usually prefer to use their own material. The one inch shaft would be a much better engineering solution than your existing shaft. If your existing shaft has an integral collar, you can just add a stop collar to limit lateral movement. A good hardware will carry these.
Garrett: I much resemble your description, and have noticed the male response to my niece who wears an OMG size bra............men rarely notice that she has emerald green eyes, and she is charged one tenth what I am charged at the local scrap yard for the same material.
Bobby: You may be confused for Sarah Palin at the machine shop.
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Post by bobby1 on Oct 20, 2008 11:52:18 GMT -5
Appearance-wise, there'll be no confusion, knowing what I doing......no problem. Bob
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Post by cpdad on Oct 20, 2008 18:56:56 GMT -5
akansan....i will be more than happy to make another shaft for you.
you will need to only pay actual cost of material.....and shipping....no labor charges at all ;D
you or someone will have to come up with some kind of drawing whether on a napkin..or a piece of brown paper bag ;D...or sometimes by phone we can figure it out....thats how me and rockhobbit figured hers out ;D
anyway...if ya need any help....ill give you a hand...kev.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Oct 20, 2008 20:16:56 GMT -5
cpdad , since your moving up to a full 1" shaft, couldn't you extend the length also to incorporate another wheel on each side? Or is the bearing separation not enough for stability?
Dr Joe
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Post by cpdad on Oct 21, 2008 22:19:06 GMT -5
dr joe....she is putting 2 wheels between the inside of the bearings.....which should be fine...that will work.....as best as i can tell...she has only room for 2 wheels between the bearings....that means 4 inches or so between the bearings....i think . yep....the shaft could be extended thru the bearings to include 2 more wheels per end....or an expando drum. but what happens is there is a draw back to homemade equipment.....the normal shafting for diamond wheels is perfectly straight...i mean machined...or ground and polished....of course i would machine perfectly straight. if normal material is used....it may run out. 002 thousandths of an inch....then add in the .002 of an inch clearance of the wheel.....then factor in the length of the material.....the run out can add up to about a good .016 of an inch. it cant really be seen by the eye.....but it can cause a hopping on a stone that 1 is trying to grind... on the hard wheels...and thats not good. of course....once it reaches the softer wheels the run out dont matter so much ;D i done went and got drunk....so i gonna go now ;D here is 1 i made for rockhobbit...an arbor....with special flanges and stuff....it was damn near 3 foot long....i had about 4 days in this thing....but it worked out great.....it is machined all over for 0 run out......and ya....thats my design for lateral wheel pressure....kev. click
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Post by akansan on Oct 23, 2008 9:39:59 GMT -5
This one is actually set up more in line with a Genie - the pulley is between the bearings with two wheels on either side. The new shaft will just be a straight piece of stock with left threading on one side and right threading on the other. In theory, I could get a longer shaft and add additional wheels to it, but then it wouldn't fit under the hood.
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Post by cpdad on Oct 23, 2008 20:29:40 GMT -5
akansan....if ya know what ya want....send me a pm. ;D
if ya think ya know what ya want....send me a pm. ;D
if ya dont quite know what ya want....but ya think ya might know...send me a pm ;D
if ya dont know at all what ya want...but suspect something....send me a pm ;D.
if ya aint got nothing in the works yet.....i will make what ever you need... or want.....hows that for simple ;D....kev.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Oct 25, 2008 8:19:16 GMT -5
cpdad even drunk, your pix look good ;D.
akansan make hood additions (cut up a couple of buckets up and attach them to the original hood, it's worth it to have more wheels), yours is going to be way simpler than that work of art cpdad posted. Don't forget to drill & tap both ends for polishing plates.
Post a couple of pix of your arbor.
Dr Joe
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