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Search: Posts Made By: Gerald D
Forum: Rails & Rollers Tue 09 March 2010, 03:16
Replies: 92
Views: 119,215
Posted By Gerald D
The rail changing was only ever for a ShopBot...

The rail changing was only ever for a ShopBot Z-axis, which is quite different to the x and y axes. So, a rail isn't a rail.
Forum: Rails & Rollers Mon 08 March 2010, 22:27
Replies: 92
Views: 119,215
Posted By Gerald D
I suspect that if you did the calcs, you are...

I suspect that if you did the calcs, you are going to find that a sandwich of 1/8" steel and 3/16" steel might be more flexible than 1/4" aluminium. I don't think you have an appreciation for how...
Forum: Rails & Rollers Mon 08 March 2010, 22:17
Replies: 92
Views: 119,215
Posted By Gerald D
:confused::confused: I have never replaced...

:confused::confused:

I have never replaced (changed out) rails and I have never used hardened rails for the x and y axes. You may be confusing something I said about the old ShopBot z-axis that...
Forum: Rails & Rollers Mon 08 March 2010, 02:33
Replies: 92
Views: 119,215
Posted By Gerald D
See post #59 above.

See post #59 above.
Forum: Rails & Rollers Mon 01 March 2010, 20:17
Replies: 92
Views: 119,215
Posted By Gerald D
The overhang of the alu rail past the steel beam...

The overhang of the alu rail past the steel beam is very short and there are no concerns of it bending over such a short distance.
Forum: Rails & Rollers Tue 04 November 2008, 09:50
Replies: 92
Views: 119,215
Posted By Gerald D
Fred, that spacing is okay for carrying the mass...

Fred, that spacing is okay for carrying the mass of the parts vertically downwards. However, the forces at the cutter are mainly horizontal, and wheels also experience quite a bit of horizontal...
Forum: Rails & Rollers Tue 04 November 2008, 08:47
Replies: 92
Views: 119,215
Posted By Gerald D
. . . . The only thing that worries me a little...

. . . . The only thing that worries me a little is spacing of the screws for the thin V-rails. I think it should be less than 100mm.
Forum: Rails & Rollers Tue 26 August 2008, 07:15
Replies: 92
Views: 119,215
Posted By Gerald D
Heath, that falls within the M12 "thin" nut and...

Heath, that falls within the M12 "thin" nut and M12 shim washers mentioned on M1 20 100 A. You might be able to use a "full" nut instead of a thin nut.

(I see that drawing does show the V-Cap on...
Forum: Rails & Rollers Tue 26 August 2008, 07:12
Replies: 92
Views: 119,215
Posted By Gerald D
I wish BWC would draw rollers and a car riding on...

I wish BWC would draw rollers and a car riding on that track.....the overhang on the roller mountings would be quite a lot. (longish cantilever shaft with the roller at the end).
Forum: Rails & Rollers Fri 15 August 2008, 21:08
Replies: 92
Views: 119,215
Posted By Gerald D
This week I finally got my 20 rails (total length...

This week I finally got my 20 rails (total length 60meters [200 ft]) done for 5 MM's. I will be the first to agree that those V-Strip rails on alu look VERY attractive. It might be a slow process,...
Forum: Rails & Rollers Fri 15 August 2008, 13:23
Replies: 92
Views: 119,215
Posted By Gerald D
Thanks for the pics. So, do the rails fit snugly...

Thanks for the pics. So, do the rails fit snugly into the corner of the alu?
Forum: Rails & Rollers Wed 13 August 2008, 22:49
Replies: 92
Views: 119,215
Posted By Gerald D
Tapping holes in alu is a pleasure with a...

Tapping holes in alu is a pleasure with a cordless drill and some kerosene [paraffin] :)
Forum: Rails & Rollers Tue 05 August 2008, 20:45
Replies: 92
Views: 119,215
Posted By Gerald D
Amazing the stuff you guys remember! :D ...

Amazing the stuff you guys remember! :D

Nils/Sean, how snugly does the V-Rail sit inside the corner of the alu? Is there enough radius/bevel on the V-Rail to clear the fillet in the alu?

PS....
Forum: Rails & Rollers Thu 24 July 2008, 21:09
Replies: 92
Views: 119,215
Posted By Gerald D
Nils, how straight are those rails when you lay...

Nils, how straight are those rails when you lay them side to side? It might be interesting to you that during their production, the last step after hardening, is to bend them straight. They are not...
Forum: Rails & Rollers Thu 07 February 2008, 05:23
Replies: 92
Views: 119,215
Posted By Gerald D
Which option? To replace the alu with steel? If...

Which option? To replace the alu with steel? If that's the case then there is not much I can add to the discussion. I am sure everyone can figure out what will personally suit them better. The Alu...
Forum: Rails & Rollers Tue 05 February 2008, 22:38
Replies: 92
Views: 119,215
Posted By Gerald D
I don't think there are major advantages of one...

I don't think there are major advantages of one system over the other. Both options offered in the drawings are sound. Substituting steel for the alu angle is also okay, but you need to figure out...
Forum: Rails & Rollers Mon 04 February 2008, 11:45
Replies: 92
Views: 119,215
Posted By Gerald D
Looking at my drawing above, the motor mount...

Looking at my drawing above, the motor mount holes are based on the 28mm [1.1"]. Cut off the alu angles so that you have a slight clearance at S2 and so that the weight is carried at S1.....what...
Forum: Rails & Rollers Mon 04 February 2008, 11:34
Replies: 92
Views: 119,215
Posted By Gerald D
Alu is weak compared to steel when used as a beam...

Alu is weak compared to steel when used as a beam to carry weight. The alu was included in the drawings for this particular application after considering its advantages & disadvantges. The only...
Forum: Rails & Rollers Mon 04 February 2008, 11:15
Replies: 92
Views: 119,215
Posted By Gerald D
What is your objection to alu extrusion as per...

What is your objection to alu extrusion as per the drawings?
Forum: Rails & Rollers Sat 06 October 2007, 06:32
Replies: 92
Views: 119,215
Posted By Gerald D
. . . . there is a third one . . . . That...

. . . . there is a third one . . . .

That the rail locates to extruded, and not sawn surfaces.

. . . . a very important third one that has been eluding me until waiting in the car for wife...
Forum: Rails & Rollers Fri 05 October 2007, 12:17
Replies: 92
Views: 119,215
Posted By Gerald D
Sean, here are my dressed up doodles: The...

Sean, here are my dressed up doodles:

The white motor shafts shown are the shorter 32mm shafts from the geared motors:

444
30mm tall angle iron rails

445
V-Cap rail attached to inside...
Showing results 1 to 21 of 21

 
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