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Post by IronMan on Mar 8, 2004 12:46:50 GMT -5
Hello Jamie,
Any progress on using bearings instead of the bronze bushings? Please let us know, I will be approaching that part of the project soon, and any help would be appreciated.
cheers
IronMan
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Post by Jamie Harris on Mar 8, 2004 14:24:14 GMT -5
Well, I was looking at the journal boxes again this weekend. I think I am just going to try my original idea and if it doesn't work i'll have to try something else.
My plan is to bore out the inside of the journal box for a roller bearing that has a 1.25" OD and a .500 ID. Then i'll bore a relief beyond that so the end of the axle has a place to go. Finally I was going to cut the end of the axle down to .500 after it exits the wheel, and make it long enough so that it goes through the bearing and has enough length to account for any spreading of the trucks. Hopefully the bolsters will keep the spread to a minimum but who knows. Like I said, I am guessing that this will work. I have not been told of a better way to do this. If anyone has ideas please let me know.
Thanks,
Jamie
who needs to get back to work on his A3 soon!!!
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Post by IronMan on Mar 9, 2004 0:34:19 GMT -5
Hello Jamie, Thank you for the info, but I am a little confused, or I am not calculating something right. If I double the the journal box size from .625 to 1.250 how could you insert a 1.250 OD bearing ? or are you going to modify the size of the journal Box to accomodate the bearing? in that case would you not trow out of wack the look ? or are you going to do something to the journal box that would alow the use of a 1.250 OD bearing ? Well enough questions for tonight, Once again thank you for taking the time to reply to my question, I am sure it is of interest to many people. Was there not someone who previoulsy used bearings ? who would care to help us out?  Cheers, IronMan |
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Post by Jamie Harris on Mar 9, 2004 9:34:30 GMT -5
You are right, it is not a 1.250 OD bearing, it is one size smaller than that. Check out the update that I just posted to my A3 progress site, it has a picture and a description of what I was talking about. Maybe that will clear up my explaination about the bearings.
Thanks,
Jamie
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Post by DavidT on Mar 9, 2004 11:20:04 GMT -5
I have bored out a set of journals to 1 1/8 for an R8 bearing. That just fits with a loose fit. The axle could be a little shorter but I have recessed enough to allow for the lenght on the wheel sets that are already done. I got six sets of columns silvered soldered. It helps to have the top piece long enough to make a lip to hold the piece of silver solder while heating. I tip them at about 45 degrees. Also I could not get them hot enough with the spacer block in place, it sucked up all the heat.
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Post by Jamie Harris on Mar 9, 2004 13:28:55 GMT -5
Hey David, I had the same issue as you when silver soldering the columns. I had to heat them forever with my mapp gas torch to get the solder to flow. So you are making 6 sets of trucks? That's ambitious...
Does your bearing design resemble what i'm doing? Is there anything that you would change? Just wondering if I need to change direction before I get too far into the journal boxes.
Thanks,
Jamie
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Post by DavidT on Mar 9, 2004 19:52:20 GMT -5
Hi Jamie. I am making only 4 pairs. I have 20 wheels make from 5" HR cookies. Some of the wheels are already Locktited to the axles which where made for bushings so they are a little long for the bearings which are fairly narrow. The bearings may have to be pressed on. Other axles are not yet machined, so I will make the bearing end shorter. I bored the journals for the bearings then made a big recess for the long axle ends. The bearings are loose. I read that is what fo do someplace. Let the bearing rock around and be tight on the axle.
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Post by IronMan on Mar 9, 2004 19:59:31 GMT -5
Thanks Jamie.
Now I just need to go out and get some bearings, I think you got it right, keep up the good work and the updates on your site.
I am also getting the DRO from the Shumatech site for the lathe did you make the thing yourself ? was it hard?
Cheers,
IronMan
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Post by Jamie Harris on Mar 10, 2004 8:48:48 GMT -5
Actually I cheated on the DRO and bought one used from a guy on the Yahoo group. I already had the scales so it was a no brainer for me.
Jamie
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Post by IronMan on Mar 10, 2004 14:35:23 GMT -5
Hey Jamie, Now that was smart thing to do at least yours works, mine is going to be an experiment that will take away valuable shop time. But then again it is getting nice out and it will be time to take the motorcycle out and the lawn mower too for that mather  IronMan |
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Post by Jamie Harris on Mar 10, 2004 15:34:41 GMT -5
Ahh yes, motorcycles, racecars, lawn mowers, trains, machinery, beer... All loves of my life that seem to become active this time of year. I need to clone myself just so I can get more toys.
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Post by IronMan on Mar 23, 2004 16:06:17 GMT -5
Hey Jamie,
I did some research on bearings, and I came across one site where the bearings used for the journal boxes, where R6ZZ I talked to a verry good mind of mine, and he just dropped off a few for me to try. I think it will be perfect they are 7/8" OD 3/8" ID and .280 in thickness. Right now I can not work on my project I have a real bad back, so I am doing research and drawing all I can in preparation for when I will be able to get back to it.
Cheers ;D
IronMan
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