Re: [CAD_CAM_EDM_DRO] Beginners screws ( was ACME ( was Re: leadscrew,

Dave,
thank you for the blessing!
Just want to report , that I was at Home Depot and carefully inspected
caster wheels.
They seem to be perfectly round to me!
Designated them as important component of the future guideway.
Alex

----- Original Message -----
From: turbulatordude <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, May 16, 2003 10:44 AM
Subject: [CAD_CAM_EDM_DRO] Beginners screws ( was ACME ( was Re: leadscrew,


>
> The point I was trying to make here is that if a beginner wants to go
> dirt cheap, garage door track and all-thread with plywood tables,
> fine. the experience gained will make the better machine MUCH
> better. and faster too. learning on some precise and expensive
> stuff makes one naturally measure 5 times, CAD it out three times,
> then drill three sets of holes to 'fix' for parts that were unseen in
> the first place.
>
> If you figure you will one day need a 1" ball screw, but for now have
> a piece of 1/2 ACME you can use, then make the table and spaces for
> nuts big enough to accept the 1" nuts and flanges and such.
>
> imagine making a table that just makes it, feeling clever how you
> made things tight with just barely any clearance, but.. you'd like
> just a little more Z space, then upgrade your X and Y to 1" Ball
> Screws and raise the bed by over an inch to accommodate....
>
> The other part is buying twice is the other concern.
> For my test, I took a 1" pillow block bearing and pressed in a Delrin
> block with 1/2-13 all-thread taped hole. I spun the delrin nut to
> move the table.
>
> Cost :
> $6.00 10 ft 1/2-13 all-thread
> $9.00 1" pillow block
> $8.00 1.5" dia Delrin
> $20.00 for 2 pieces of uni-strut
> $48.00 for wheels.
>
> less than $100.00 for the one looong axis., leadscrew, nuts, track
> the works.
>
> For my learning experience spending $100.00 is well worth the
> investment.
>
> I would not care about tossing the works, but all the parts have
> value for other things so are not pure scrap.
>
> Yes, I did have to make plates and mounts and stuff, but all that was
> drilled holes, no precision machining.
>
> I think building a mini for experience is a great idea. use wood and
> roller-skate wheels and stuff to get an idea what you need to do the
> job. learning itself is worth the effort.
>
> and once you do it once, you'll realize just how easy it is to make a
> table. it's like Nike says "JUST DO IT"
>
> Dave
>
>
>
>
>
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "David A. Frantz"
> <wizard@e...> wrote:
> > >
> > >
> > >snipped alot of stuff<<<<<<<<<<<<
> > >
> > I have to disagree here slightly there is not a huge difference in
> > pricing between ACME thredad and all thread. You end up spending
> a
> > greatdeal of money that you wouldn't otherwise spend if you just
> upgrade
> > to the ACME in the first place.
> >
> > Also there are design points where even the tought of designing for
> the
> > ultimate makes the project impractical. Yes these are often home
> > projects but it isn't unheard of in an industrial situation.
> >
> > So the reality is that the individual has to make due with what he
> can
> > justify. It does not hurt though to understand that ACME screws
> are
> > not that much out of line.
> >
> > Thanks
> > dave
> >
> > >
> > >My advice stays the same. DESIGN with the ultimate in mind (ie:
> > >leave the space for it), but TEST with cheap crap(cheap
> allthread),
> > >and INSTALL the best cost/function you can get away with.
> > >
> > >As a note here, I used some cheap all-thread on a table and found
> > >mistakes in the table that would have prevented me from using the
> > >ball screws I so desired. the $10.00 for the screw was well worth
> it.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
>
>
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