Personally, I would not weld the pieces together. I think the metal will
distort. I would try two sections butted together and test it out.
-Tim
----- Original Message -----
From: 'joe biunno' via Legacy Ornamental Mills
To: legacy-ornamental-mills@googlegroups.com
Sent: Tuesday, December 23, 2014 8:51 AM
Subject: Re: linear bearing mod for a legacy
update time...was able to purchase some of the railing i intend to use from
ebay...great deal...worked out to be $2.50 a foot...will soon try welding two
pieces together(they are 22" each...total of ten pieces purchased)...hopefully,
no "bumps"...was a little concerned because i forgot(duh!), that the legacy
railing is laid down on the "Y" axis...this presents a 7/8" wide opening and
the need to redesign the attachment hardware...but the linear rail "nestles"
into legacy rail quite nicely, to the point of self centering itself, if so
desired...next, picked up a piece of 1/8" X 1 1/2" flat steel from
mcmaster...this slides into the legacy rail...that space is 1 5/8" wide, the
difference of 1/8" can be very helpful, as i plan on drilling and tapping 10-32
set screws into each side of the legacy rail so the set screws are aligned with
the steel bar... in effect, you can lock in place and center/adjust the 1 1/2"
steel bar within the limits of that 1/8" difference...will be helpful when
setting up the linear rails and making sure that they are parallel...there is a
small gap between the bottom of the linear rail and the steel rail, so just
need to drill and tap holes that line up with the pre-drilled holes on the
linear rail and use the steel bar as a clamp...ordered one bearing carriage to
try as a sample but have not gotten it yet...but so far, things seem to be
going well...if welding the linear rails works out, there will be a big savings
(about $150.00, in my case)...sorry for the poor photos...i need a camera that
i can put a macro lens on...thanks...and as always, comments, suggestions and
critiques are welcome...joe
On Thursday, December 18, 2014 5:45:22 AM UTC-5, joe biunno wrote:
mike,
excellent point and i have given it a good amount of
thought...basically it boiled down to the design of the rail and
carriage...from what i have researched, the type of rail and carriage that will
have little to no sawdust issues has a very high mounting point...could be as
much as a total of 3" or more, if you do the "X" and "Y" axis'...this presents
other issues of router bit reach and carriage attachment to the lead screw...i
anticipate the necessity of simply having to use a blow gun while the machine
is working...a pain in the ass for sure, but i have seen cnc machinery in
action and it seems often enough that a blow gun is used to keep sawdust
invasion down to a minimum...i guess in some instances it is a must...if you
are standing there watching as you do the first twist, of let's say eight, on a
workpiece, i do not see an issue of using a blow gun...plus my circumstances
present other problems...i need two, 16ft pieces of rail...the only way to do
that is to join sections together...welding extruded aluminum is not one of my
welding skills, so the fact that this rail is steel is a big plus for me...i
believe two sections of steel rail can be TIG welded together, filed and sanded
down and there will be no "bump" as a carriage passes over it...i am also
considering the fact of how much i use my legacy(and how much anyone else in
the group uses their machine)...my machine can easily go a month or two with no
use whatsoever(lately, business STINKS!)...realistically, if i had that much
work, i would buy the cnc machine and call it a day...but to spend several
thousand dollars to get even a higher end linear bearing set-up for my present
machine does not seem logical and is not in my budget...anyway, appreciate the
comment and would certainly welcome more,especially if it helps to solve a
potential problem that i missed(THAT HAPPENS A LOT
LATELY!...lol!)...thanks...joe
On Wednesday, December 17, 2014 11:01:47 PM UTC-5, LILtwisted wrote:
My greatest concern for this system is sawdust. How do you intend to
keep them clear? Sawdust in them will be like a road block. Cheap will be a
disaster, spend the money you need to, to do it right the first time. I would
not use these unless you have a solution for the dust. Look at open bearings
instead
Mike
OK
On 12/17/2014 7:58 PM, 'joe biunno' via Legacy Ornamental Mills wrote:
curtis,
took a look at that rail set up and unless anyone is
considering a major re-design and rebuild of their legacy, i do not see it
working well on a legacy...you need to build your own carriage and i did not
see a way to adjust the bearings to eliminate play...my intention is to simply,
and as cheaply as possible, modify the legacy...using the pbc rail and
carriages, i think there will be just a bit of drilling,tapping, some minor
filing/sanding of some of the mcmaster-carr hardware and your done...probably
the most difficult aspect of this mod would be the careful layout of holes that
need to be drilled...all have to be dead on the mark...anyway, i've decided
move forward on this so i will be posting progress,photos and unforeseen
problems, hopefully with solutions...stay tuned...joe
On Wednesday, December 17, 2014 6:29:52 PM UTC-5, Curtis wrote:
Joe
that rail looks good, but have you checked out
https://www.kickstarter.com/projects/openrail/openrail-open-source-linear-bearing-system
? there rail also looks like it would work out for you. I have not priced out
the cost, but It couldn't hurt to take a look.
I too have been looking for a good (but cheap linear rail for a
while.) so far Im not ready to take the plunge yet. BUT, WHERE There is a
WILL, There's ALWAYS a Way! And at this time And stage of my life I can take
as long as its needed to do my homework before I start re-designing my Legacy,(
That is more than what Ive already done.) ;-) It will happen, the only
question is when?
I wish you luck Joe. Please give us the blow by blow details, on your
project.
C.A.G.
----------------------------------------------------------------------
From: "'joe biunno' via Legacy Ornamental Mills"
<legacy-orna...@googlegroups.com>
To: legacy-orna...@googlegroups.com
Sent: Wednesday, December 17, 2014 5:48:49 PM
Subject: Re: linear bearing mod for a legacy
well, seems i might be going with this bearing set up from PBC
LINEAR...it is what they call their "commercial rail" line...it is their least
expensive rail and carriage set up...specifically, the CR30 is the largest size
that will go on the legacy rail without having to modify the "Y" carriage
mounts...it is a total of 1 3/16" wide(the legacy rail is 1 5/8" wide)...each
carriage has a load rating of 94 lbs., so no issues there...the carriages are
adjustable, if they should ever need to be(middle bearing/wheel is adjustable
to set any load anyone might want)...now the best part, the price...the rail is
priced at $.023 per mm(this works out to be $7 per foot...most all other rails
i have found are $30 to $40 per foot)...for example, if you wanted to put a
slide set up on a legacy 1200, you would need two rails, at 2100mm
each(83")...approx. $50 per rail...the carriages are $54 each(most other
carriages are $70 to $90 each)...X 4 = $216...total cost(not including some
mounting hardware) is $316 plus shipping...the "Y" axis needs two 600mm rails
and four carriages, total cost $244...total to do both the "X" and "Y" axis' is
$560...throw in $40 for hardware, $600 total(plus shpg.)...perhaps reasonable,
for this type of mod...plus i like the fact that it is made by a very reputable
company and if i should ever need any thing replaced, there should not be an
issue...cost for doing my beast comes in at approx $750, which is about $1300
less than anything else i have seen...so it now boils down to if i feel i
deserve an early christmas present...plus it goes down as a business
expense...anyway, would like to here if anyone has any comments, suggestions,
hidden flaws that i overlooked, or any thing else...much appreciated...joe
On Tuesday, December 16, 2014 4:58:40 PM UTC-5, joe biunno wrote:
starting a new topic here to address help in possibly setting up a
legacy with linear bearings... suggestions for possible sources of materials
and anything else that might make this mod as easy and inexpensive as
possible....first photo is of a piece of sample track and a carriage type, both
from PBC LINEAR, sitting on a piece of legacy rail...this is PBC's "low profile
redi rail' line...total height is 3/4"...the rail is 1 7/16" wide(legacy rail
is 1 5/8" wide)...this carriage is 3" wide and might not work well on the the
legacy...but i did get it as a free sample it does allow me to play with the
mounting a bit...difficult to see, but there is a 't' nut inside the legacy
rail that was gotten from mcmaster-carr...it has a 1/4-20 thread in it and
needed very little modification(file the bottom corners a bit and filed the top
down just a hair) to make it fit the legacy rail...the PBC rail comes pre
drilled with holes exactly in the center of the linear rail, so it is
practically self centering onto the legacy rail(due to the "t" nut)...they also
have a set up called "redi-rail slide" that is a TOTAL of 1 3/8" wide, which is
less than the legacy rail...the height is a bit more than the low profile rail
though(15/16" +/-), but certainly acceptable, i believe...the only problem with
these set-ups(and others from other manufacturers) is the cost...usually rail
will cost around $30 per foot and a single carriage can cost around $70...so an
"X" axis alone would be in the neighborhood of $640(2-6ft pcs. of rail and 4
carriages)...add in the "Y" axis(do not see a need to do the "Z" axis), and you
could easily be spending $1,000 when shipping and other expenses are factored
in...so a pricey mod for sure...anyone have some definitive, less expensive
sources for rails and carriages?...i do remember reading jon preston's posts
regarding his mod (excellent work!) and his finding inexpensive bearing
hardware on ebay...and i have seen the same or similar my self, but they all
seem to be coming from china...and with all due respect to burney's mod, this
is a bit better due to the fact that you can adjust the bearings on each
carriage for wear(which should be in about ten to twenty years!...LOL!)...these
rails will also add some rigidity to the legacy rails(if it's even needed at
all)...joe
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