Re: bruder excavator help
Assuming you are building the bruder model based on the CAT320 there are several ways to make your base swivel. You can mount a spur gear on the track drive chassis and run a servo opperated pinion gear on the main chassis that will allow 360' rotation, or you could also simply mount a servo converted to 360' rotation to the main chassis and make a plate to adapt the lower chassis that you mount a servo horn to. If you need any help I can further assist in pm's or email as I have a current project going with one as well.
Secondly as for the screw drives I build them and can also help you in producing sets for your's. Take a look at Pumptech's or my build threads to get a good idea of what can be done.
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~Tyler~
RockSolidCustoms
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