Re: [CAD_CAM_EDM_DRO] Re: Jeff Davis' CNC Retro Question - Ball screws

Jeff, you have done an outstanding job describing your retrofit step by
step. One thing that I may have missed - how did you finish the ends of
the ball screws you purchased? I can see from your sectional views that
where the ball screw goes thru the bearings - it has been turned down to
fit the bearings. In the X axis view, I can see a shoulder for the
bearings and a dark green item, a nut, I presume. Then there is another
step down in the diameter to accomodate the pulley. Did you have to
anneal the end before machining and threading? Did you use carbide
tooling in the lathe? Any grinding operations?

I'm contemplating a similar bearing/pulley arrangement for my soon to be
built CNC_CAD_CAM plasma cutting table.

Cheers, Peter

jeffdavis516 wrote:

> Alan,
>
> What I'm trying to do is offer my plans to people and if they are not
> comfortable with making some of the parts or can't because of lack of
> proper equipment, I was going to quote on making the parts. I have
> not given any thought yet on price to produce parts but can if you
> want. It's not to hard to create the ball screws if you have a
> lathe. I got the ball screw material from the standard internet
> sources (McMaster Carr, Reid Tool). The bearings also can be had
> from (MSC or McMaster Carr).
>
> Jeff Davis
> http://www.homecnc.info
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
>
>>Hi Jeff,
>>
>>Sounds like you've got it covered fine! and 131 IMP is plenty
>>
> fast, for
>
>>my use!
>>
>>I'm interested in a set of ball screws and bearings, if you are
>>
> going to
>
>>offer them. What are the prices? Or your source?
>>
>>Alan KM6VV
>>
>>
>>jeffdavis516 wrote:
>>
>>>That is exactly what I thought as well. I'm not an electronic
>>>engineer so what does it mean "Continuous" and "Peak"? It sounds
>>>
> to
>
>>>me that the motor can change it's torque when needed (up to 430
>>>
> oz/in)
>
>>>All I know is I don't have any problem running my Drill Mill.
>>>
> Have
>
>>>you looked at my movie on my web site?? In the last part of the
>>>movie my Mill is running that finish cut at 131 IPM!!!
>>>
>>>I machine at standard feed rates that are calculated by my cutter
>>>
> and
>
>>>the RPM of the spindle. I can't get real fast cutting feedrates
>>>because the Drill-Mill does not have a fast running spindle.
>>>
> Don't
>
>>>most CNC mills run the spindle at 5000 to 10000 RPM??? I know
>>>
> that I
>
>>>have pushed the feedrate too much and broken a 3/8 EM and the
>>>
> motors
>
>>>did not stall at all.
>>>
>>>Jeff Davis
>>>http://www.homecnc.info
>>>
>>>--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...>
>>>
> wrote:
>
>>>>Hi Jeff,
>>>>
>>>>Thanks. I would have thought you'd need more HP or continuous
>>>>
>>>torque
>>>
>>>>then that. 1700 RPM and 50 oz/in continuous torque. What feed
>>>>
> and
>
>>>>rapids are you getting? If I've read the label on my daisy-
>>>>
> wheel
>
>>>>printer motors correctly, I can get about 85 oz/in torque, and I
>>>>
>>>think a
>>>
>>>>similar RPM. So they're STILL a possible for a Mill/Drill
>>>>
>>>conversion.
>>>
>>>>Anyone interested in my Minerta servos? I'd trade for some
>>>>
> Gecko
>
>>>>G320/340's!
>>>>
>>>>Also I might be interested in a set of ball screws and
>>>>
> bearings, if
>
>>>you
>>>
>>>>are going to offer them. I've got quite a way to go to be able
>>>>
> to
>
>>>start
>>>
>>>>a retrofit. I'd like to get a set of Gecko's next.
>>>>
>>>>Alan KM6VV
>>>>
>
>
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