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Posted by VFP on April 24, 2008, 1:06 pm
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> On Thu, 24 Apr 2008 05:54:44 -0700 (PDT), ppm
>
>>hi,
>>we are looking at a new machine for which the manufacturer
>>suggest to go in for guidebush less type sliding head machine.
>>Can anyone give their experience on using this type of machine
>>on the advantages and disadvantages of having this type of
>>machine over the guidebush type sliding head machine.
>>Lawrence
>
>
> Shorter bar ends.
> Less run-out - *IF* you're turning the OD.
> Don't have to buy guide bushings:-)
>
> Just keep in mind that the length of your parts will be limited
> by the barstock diameter.
>
> We sometimes run the cam operated Swiss (sliding head) without
> guide bushings. On these machines you can remove the guide
> bushing holder and slide the head up into the tool tree. Works
> great for profiled material (hex, square), and short parts. Wind
> up with little 2-3" bar ends, instead of 6-8" bar ends.
>
> Star used to have what they called a 'Chuck Work' option. It was
> a spindle nose extension that fit up into the tool tree (after
> removing the guide bushing holder).
>
> A guide bushing-less machine has it's place, but if you plan to
> run parts that exceed the length-to-diameter ratio of the
> barstock, you won't be happy with it. The only way to make
> longer parts is to do multiple chucking's, and then you'll run
> into concentricity problems.
>
> Matt
>
Matt,
Tsugami has models that can convert from guide bushing to bushing
less and back so you can do longer pieces if necessary. Not sure
about other brands. Maybe Dan Murphy will followup and tell you
more.
Another advantage of running without the guide bushing is that you
don't need ground stock. But as Matt Stawicki said your length to
diameter ratio is limited
VFP
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>we are looking at a new machine for which the manufacturer suggest to
>go in for guidebush less type sliding head machine. Can anyone give
>their experience on using this type of machine on the advantages and
>disadvantages of having this type of machine over the guidebush type
>sliding head machine.
>Lawrence