On Wednesday, February 02, 2011 05:49:16 am Mark Wendt did opine: > On 02/01/2011 04:54 PM, gene heskett wrote: > > Possibly Steve. I have at least every other higher end dremel ever > > sold around these parts, but have never seen a Model 398. B&D makes > > a 3 speed for about a $40 bill that is better, but its output shaft > > is also rather spongily mounted. > > > > I have purchased another z casting for my micro-mill, with has a > > nominally 1 and 15/16" bore for the quill to travel in, and have been > > unable to determine if its worth the effort and $140 for a Proxxon > > because even the peddlers who advertise it cannot tell me if the > > chuck is rigidly attached to the motor armature, or runs in its own > > bearings with some sort of a self aligning coupling to the motor > > shaft. As all such tools sold on this side of the pond seem to be. > > The other possibility might be a trim router, but I haven't found one > > that is small yet although the Dewalt comes pretty close. The > > rotozips, at least with their skin on, also look to be too large. > > > > That leaves sawing off the end of the casting and fabricating a new > > mount. an enticing thought IF I could find (or make) an emc > > controllable gimble mount to allow something like the Proxxon to have > > the motions that Stuarts new toy has. That sort of a capability > > would be better spent building something like Marks machine because I > > would want to carve gunstocks with it. With the gimbled Z axis, I > > could reach into the thumbholes and carve those quite precisely. > > > > Yeah, I dream a lot. :) > > Gene, > > Don't know if you follow much of the goings on over at CNCZone, but > there's a fella over there that's designed and is selling a PID > controlled speed controller for routers. The reports from the guys > using it are all thumbs up. Maybe you could think of a full sized > router, which would give you a bigger choice in tool bits, and use the > PID speed controller to settle that wild mustang down for certain bits? > > Mark
I am not sure what the applicable acronym for the controller I have would be, its the repaired unit from the original head of a micromill. Speedwise it is so stiff I had to build an ammeter into the motor leads so I could see how hard it was working because that is the only way I can afford the fuses, currently 2 amps. Thinking, when I next run out, of replacing them with 2.5 amps since the hexfet in the output stage is now a 22 amp rated device. Old pc psu's are an excellent source of repair devices for those. Same physical size as the OEM device, but about 3x the voltage rating and about 3x the current rating. This is a case of TANSTAAFL though as the bigger output devices need correspondingly heavier driving devices to drive their increased gate capacitance, so I did some testing while watching the driver transistor with an IR thermometer to see if it was heating excessively but I got by with it, the switching times remained short enough that neither device warmed up enough to concern me. That whole controller now shares a big rat shack project box with a PMDX-106 so the computer or I can control it. Been there about 2 years now with no vent holes in the box and run times of a week or more. I keep forgetting to turn it off when I'm done as its silent. :) I think its running right now. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> Be sociable. Speak to the person next to you in the unemployment line tomorrow. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
