Re: [CAD_CAM_EDM_DRO] Room for everybody was Re: Threaded Rod WORKS!

Hi Gang;

I mentioned this thread to a friend, and he made this suggestion for a quick and
dirty adjustable load, zero backlash nut. You can make it as follows:

1. Take a standard nut for the type of rod you have, and put it in a drill
press vice, such that the jaws are on two of the flat sides, and one corner
is sticking up.

2. File or grind just a little of the corner flat, and make a center punch
dimple right in the middle of it.

3. Drill and tap a set screw hole.

4. Turn the nut sideways in the vice, such that the top and bottom of the nut
are in contact with the vice jaws, and the set screw hole is towards you.

5. Make a saw cut down the middle of the sides of the nut, perpendicular to
the hole the threaded rod will reside in, and through the set screw hole,
until the cut ends at about 2/3 to 3/4 of the way through the nut.

6. Place the nut on your threaded rod.

7. Get a _tapered_ screw that is a little smaller then the set screw hole near
one end, and a little larger then the set screw hole near the head.

8. Grind off enough of the tapered screw such that it will turn 1.5 to 2
turns by hand in the set screw hole before it starts to, "grab".

9. Turn the tapered set screw a little further with a screw driver to set it.
This pushes the two split halves of the nut outward in both directions,
removing any backlash, and adding a bit to the torque needed to turn it.

The caveat here, is that this will need periodic adjustment, occaissionally at
inoportune moments, but hey, what do you expect from something you can make from
junk box parts? :-)

Bill

On Fri Jan 25 14:58:42 2002, cncdxf, <cncdxf@...> wrote:

>Ballendo,
> The original post was asking if threaded rod would
>be ok for wood working. Then all kinds of answers came. It
>is obvious to me only a few people read the posts. Making
>a wooden sign using a machine that has threaded rod would
>turn out the same product as a more expensive machine. The
>proof is in the internet. There are two large sites devoted
>to homemade machines. How many people have taken an anti-backlash
>nut put it on standard threaded rod and measured the error. What
>is it? There are alot of craft people out there that are jumping
>into CNC. Their suff looks great even with a .006 error. Anybody who
>is anybody in CNC started off building their own machine. John told
>me he is getting swamped with orders. He has opened up the CNC door
>for me and others. I was milling boards for a local company using one
>of John's designs. The company just had a big layoff. So much for my
>egg money. Go back and read the posts on threaded rod, then read the
>orignal.
>
> Bob
>
>
>--- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:
>> Bob,
>>
>> I applaud John K's minimalist approach... But,
>>
>> On this list people are "doing" cnc for many different reasons, and
>> with VERY different needs and expectations.
>>
>> Some will be very happy just to have a machine that moves somewhat
>> repeatably. Period. Others are wanting/needing to work to better
>> than .001 accuracies.
>>
>> And this distinction IS NOT drawn between "amateur"
>and "commercial"
>> users! It depends on the parts needed. AND the material!
>>
>> One of the things that I find a little frustrating is that the
>> majority of posts on this list seem to refer to CNC as used for
>METAL
>> working. And "tight" tolerances. CNC is applicable FAR
>beyond "just"
>> metal. Where are the woodworkwers? Where are the plastic workers?
>The
>> engravers? The pc bd makers?
>>
>> I think Chris Strattons recent post about cyclic
>variations "ruining"
>> his tubing mandrel? to be one of the more useful bits of info
>shared
>> recently. Something many wouldn't otherwise "think of"...
>>
>> We have seen the list recently become "re-aimed" at the home shop
>> user. Okay. I hope that we will ALSO see some of those who work in
>> that "home shop" with OTHER than metal, at all levels of accuracy
>> needs, feeling free to speak up...
>>
>> Hope this helps.
>>
>> Ballendo
>>
>> P.S. What I'm saying is that there may be many who just don't speak
>> up because they may feel that their 100 step/inch machine will
>> not "measure up"... Or that a question about depositing glazes on
>> tiles to be fired (with cnc) will find no answers...
>>
>>
>> --- In CAD_CAM_EDM_DRO@y..., "cncdxf" <cncdxf@a...> wrote:
>> > Hi Ballendo,
>> > I suspect the people who had trouble with threaded
>> > rod used a regular nut also. Tapping a piece of 1/2" Delrin to
>> > run on the nut works great. I also suspect they used coarse
>> > threaded rod. John K got me to use <snip>

--
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An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no
weapon in every | by COLT; | -- Max Plank | weapon sell his
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on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ
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Constitutional Government is dead, LONG LIVE THE CONSTITUTION!!!!!

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--
----------------------------------------------------------------------------
RKBA! ***** Blessings On Thee, Oh Israel! ***** 4-19!
----------------+----------+--------------------------+---------------------
An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no
weapon in every | by COLT; | -- Max Plank | weapon sell his
hand = Freedom | DIAL | In the beginning was the | garment and buy a
on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ
----------------+----------+--------------------------+---------------------

Constitutional Government is dead, LONG LIVE THE CONSTITUTION!!!!!

----------------------------------------------------------------------------