Re: [CAD_CAM_EDM_DRO] Re: Ball screw cost and sources - Moglice - Phillycast - concrete

David A. Frantz wrote:

(snip)

>I was considering casting the rails in place, but I can't possibly
>imagine getting the parallel and level. Anyone with experience here?
>

Don't cast them in place "Raw"...... Assemble the gantry portion,
bearings and all, THEN carefully cast them in place. With the right
temporary fixtures, you should be able to "slide" the axis back and
forth to help align things.

However, I think I would build a simple "cage" first, mount the rails on
the "Cage", THEN pour it full of concrete. All you really want is the
"Mass" it provides anyhow. I'm not sure how much concrete moves around
when drying. It must move some as water evaporates.

Last ditch effort... place fixtures in the concrete that the rails
simply bolt to. Then align the rails in typical fashion after concrete
is hard.

If it truly is a first effort though, forget the concrete.... Just get
something running. The first attempt usually leaves much to be
re-engineered on "the next one".

Chris L

>
>Dave
>
>
>turbulatordude wrote:
>
>
>
>>Hi Guys,
>>
>>I may be catching the tail end of the conversatin here, but there
>>have been lots of talk about Moglice and using that to repair
>>leadscrews.
>>
>>Moglice is also pretty good for adding a low friction layer between
>>components like a saddle when you have ground the years of misuse
>>away and want to get it back on center too.
>>
>>I think that Philly Cast is for making the ways and supports and all.
>>and if you are going that far, there was at least one guy who used
>>concrete to pour the bed and I think he embedded the rails in that.
>>
>>Dave
>>
>>
>>
>>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "dcdziner" <Dcdziner@p...>
>>wrote:
>>
>>
>>
>>
>>>Jan,
>>> I dug through my archives an came up with this .PDF file that
>>>
>>>
>>>
>>>
>>was sent
>>
>>
>>
>>
>>>to me by Les Watts. http://www.phillycast.com/products/inst-nut.pdf.
>>>Although it refers to Ball Nut Applications, Les indicated to me
>>>
>>>
>>>
>>>
>>that it
>>
>>
>>
>>
>>>would work for Acme screws as well. Since Les is the guru of this
>>>application, you might want to contact him for any further
>>>
>>>
>>>
>>>
>>information, at
>>
>>
>>
>>
>>>leswatts@a... . I hope this helps.
>>>
>>>Marv Frankel
>>>Los Angeles
>>>
>>>----- Original Message -----
>>>From: <JanRwl@A...>
>>>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>>>Sent: Sunday, May 25, 2003 10:19 PM
>>>Subject: Re: [CAD_CAM_EDM_DRO] Ball screw cost and sources
>>>
>>>
>>>
>>>
>>>
>>>
>>>>In a message dated 5/25/2003 8:03:29 PM Central Standard Time,
>>>>Dcdziner@p... writes:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>You didn't dig quite far enough into their web site. The
>>>>>
>>>>>
>>>>>
>>>>>
>>compound that
>>
>>
>>
>>
>>>>>they have is pumped into a worn nut
>>>>>
>>>>>
>>>>>
>>>>>
>>>>I see! OK, I'll wait for it. Thanks. JRR
>>>>
>>>>
>>>>[Non-text portions of this message have been removed]
>>>>
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