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  #31  
Old Mon 07 January 2008, 10:11
DMS
Just call me: Sharma #9 India
 
Rajasthan
India
Thanks Gerald for clearing this up.
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  #32  
Old Wed 23 January 2008, 12:48
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Homemade V-Tyre with circlip

Hi Gerald,

I am looking at making my own V-Tyres like you did.
On the first picture of this thread you show your own design with a flange, but the drawing M1 20 121 it looks like the flange is on both sides. Is this correct?

I was wondering if it is possible to make the tyre in such a way that your bearings are pushed in from one side up against a collar which is part of the one side flange. The other side I cut a small groove in for a circlip to keep the bearings in place.

From the forum I gather that one of your first MM are still running on UnHardend tyres. Is this correct?
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  #33  
Old Wed 23 January 2008, 13:37
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Quote:
Originally Posted by Gerald_D View Post
The basic design dimensions are so that the roller is interchangeable with the BWC size2 roller - the offset from the left face to the center of the V is identical. The bore size and OD make these close to the BWC/Hepco/Yitong size 3.


BWC on left, own design right
The design was since modified to be fully interchangeable the "Size 3" produced by Hepco, Superior, YiTong, BWC, etc. The V was moved to the center and the diameter slightly increased.

From this post, you can see that you only have 2mm clearance on the one side - a 1mm collar will work for that side. On the other side there is a lot of space - easy to fit circlip there. You can make a bigger collar if you move the bearings slightly off center.

With the "re-Loctiting" of the wheels, I lost track of which wheels were where. The whole hard/soft wheel thing has become a non-issue for me. Next week we can have a closer look at the wheels.
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  #34  
Old Wed 23 January 2008, 22:59
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Thanks for that. So if I make the copmlete wheel a little WIDER, it will not catch on anything. At the moment it is 16mm wide. If I increase it to say 19mm wide, will it pose a problem....thinking about Y and Z axis as well.

Just to make 100% sure...all the wheels needed are the same size...46mm OD....X, Y and Z axis.
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  #35  
Old Wed 23 January 2008, 23:25
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Making the wheel 3mm fatter (1.5mm per side) will chew up the 2mm clearance left for other inaccuracies during the gantry welding. Rather move the bearings off-center if you are re-designing the wheel for shoulder and circlip:

Clipboard01.gif

All the wheels are the same size. The mod mentioned above will have a tiny effect on the z-axis (mounting the eccentrics).
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  #36  
Old Tue 29 January 2008, 03:57
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Can one use VESCONITE in place of the bearings.

See ... http://www.vesconite.com/industry/ap...wheel_bush.htm
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  #37  
Old Tue 29 January 2008, 04:03
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
No, a plastic bush will always be a bit flexible side to side, given that our wheel is only 16mm wide.

I have some spare "tyres", as per the pics right at the top - want to make me an offer via PM or mail?
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  #38  
Old Tue 29 January 2008, 04:18
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Ok speak to you FACE to FACE tomorrow afternoon 14:00?
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  #39  
Old Sun 05 October 2008, 06:43
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
What to do when one gets bored ?

Since there were no action over the last 3 days let me put some pic`s on the forum !
I tried it and got it right!
My interpretation of turning v rollers

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  #40  
Old Sun 05 October 2008, 11:28
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
You took that first pic at 6.44am on a Sunday?? Did the missus make you sleep in the garage again??

That wheel will give you lots of good service. (havn't worn out our mild steel experimental wheel yet - it is on a y-car)

That mandrel you used in the lathe chuck is exactly the right way to get the V-groove true to the bore!
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  #41  
Old Thu 15 January 2009, 18:19
SLINK
Just call me: SLINK
 
CHURCHVILE NY
United States of America
GERALD
I WANT TO MAKE THIS V WHEELS WHERE DO I BUT THE TYRES AND BEARING CAN YOU GIVE ME THE SITES AND ALL THE SPEC
JSLINGERLAND@ROCHESTER.RR.COM
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  #42  
Old Thu 15 January 2009, 22:18
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Slink , get the laser company to cut some steel for the wheels 1.5 mm over size and use the std bearings as per the spec`s that Gerald gave in his drawings.Bearings you can get from any bearing supplier.Get some extra wheels to play with.
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  #43  
Old Fri 27 February 2009, 14:35
MariusL
Just call me: Marius #22
 
Centurion
South Africa
. . . . . . I am using Ertalite wheels. They are a bit softer that the steel. . . . .
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  #44  
Old Fri 27 February 2009, 22:05
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Curious about the life of those Ertalyte wheels - sometimes I wonder if we can dump the wheels and replace them with solid plastic slide blocks, still on the v-rail, (like a lathe bed) . . . . .
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  #45  
Old Sat 28 February 2009, 00:14
MariusL
Just call me: Marius #22
 
Centurion
South Africa
Gerald, So you picked up on the spelling. I sometimes do that. Personally I would not give up on the wheels. The added friction that the slide block give will not be practical especially on larger machines. What I would look at is to increase the contact area. I am looking at designing an extrustion that will give about 10mm contact area on each side.
I am monitoring the Ertalyte wheels closely to see how they hold up. So far not a sign of wear. Also the machine runs very quite so it will be a bonus if they last.
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  #46  
Old Wed 08 April 2009, 06:10
MariusL
Just call me: Marius #22
 
Centurion
South Africa
Ertalyte wheels

Gerald,
The machine has been working non-stop for many weeks now and the ertalyte wheels dont show any signs of decay yet. They have not yet bedded and I think it might be a good alternative. The machine noise is also very low. Kobus came round the other day and commented on the low noise level so I take it must be a lot better than the metal wheels.
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  #47  
Old Wed 08 April 2009, 07:04
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Marius, that is great news on the Ertalyte wheels.

Kobus's machine has direct drive motors, which makes a machine sound quite rough. I guess his comment was based on this aspect. I don't think that steel/plastic wheels will make a big difference on noise, but I may still be proved wrong. :-)
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  #48  
Old Sat 26 December 2009, 22:27
swatkins
Just call me: Steve
 
Houston
United States of America
Gerald has anyone tried using brass for the wheels? Think it would work?
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  #49  
Old Wed 30 December 2009, 11:48
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Brass (or bronze) will also work.
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  #50  
Old Wed 30 December 2009, 21:12
swatkins
Just call me: Steve
 
Houston
United States of America
Then that is what I will be using... I have a nice bar just the right size for this
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  #51  
Old Thu 31 December 2009, 00:37
MariusL
Just call me: Marius #22
 
Centurion
South Africa
Gerald,
I cant believe a years has gone already since we started our build. Just to give feedback - the ertalyte wheels still look the same as when installed. The machine has worked hard almost every day of the year. So I think any of the synthetic stuff that has similar properties might work well.

Regards
Marius
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  #52  
Old Thu 31 December 2009, 00:44
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Thanks for the update Marius.
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  #53  
Old Sun 01 August 2010, 19:27
PEU
Just call me: Pablo
 
Buenos Aires
Argentina
Quote:
Originally Posted by Gerald D View Post
Tom, suggest you make them of cheap steel, or bronze, and replace them if they wear out. Do not bother to harden them. My experimental set of "soft" rollers is still quite happy.

I would spend a little more trouble on getting the Loctite to bond correctly.
Gerald, is the bronze suggestion still valid? I want to try my luck at doing the V wheels with my small cnc lathe.
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  #54  
Old Mon 02 August 2010, 00:26
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Yes, it is still valid
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