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Re: Microwave motion detectors.
开云体育Hi Ralph, Back in 2009 when this was built ? ? I designed into the lamp an expansion header and added software to monitor one input.? We were worried about vandalism so the idea was to add a PIR sensor to several of the lower lamps and if motion was detected send a CAN message over the bus to the host PC which in turn would generate an alarm via Internet which would in turn call the police. ? ? Turns out it wasn’t needed as a number of other security measures were put in place.? When I bought a bunch of the lights as surplus ? I thought I’d add that PIR sensor and use these as path lights that at night would ripple on and off based on sensed motion.? Or play colorful shows on special holidays.? Like all green on St. Patrick’s Day or Red on Valentine’s day but still ripple ON to White when motion was detected. ? Like my stair lights.? ? The holders for the lights would look something like this: ? Or as a bollard light in this case lit up with Halloween pumpkin orange and a parabolic reflector I designed to cast a 4’ diameter circle. ? But at night what’s also visible is the PIR sensor when it detects motion and it’s outside the lamp in a #D printed holder. ? I like the idea of a microwave sensor because it can be inside out of the weather and not look like there’s a motion detector.? And yes, the red LED can be disconnected but during the day the white bubble is still visible. ? Anyway, this is an ongoing project and all the lamps need a special modification to overcome a bug in the TI LED driver chip. John D. ? ? ? ? From: digitalhobbyist@groups.io [mailto:digitalhobbyist@groups.io] On Behalf Of Ralph Hulslander
Sent: May 8, 2024 7:59 AM To: digitalhobbyist@groups.io Subject: Re: [digitalhobbyist] Microwave motion detectors. ? I have one, it would be interesting to see how one is used. ? Ralph ? On Wed, May 8, 2024 at 1:06?AM John Dammeyer via <johnd=autoartisans.com@groups.io> wrote:
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Re: #CNC gear cutting
#CNC
Struggling a bit with the 9 tooth pinion gear cutting.
I have only a Mod 2 12-13 T gear cutter. My problem being as i move the cutter into the blank pinion, the teeth wall between the teeth decreases, in fact they are looking like a wedge and will not mesh with the scroll gear teeth. see photo of the parts marked 2 3? The reason I think is even though I have twisted the indexer to 20 deg. (40 degrees inclusive angle) as the cutter? moves in then the cutting diameter changes, the cutter dia is a standard 58 mm, the teeth are only 12 mm long. I think the the original pinion teeth of a chuck bought from a tool supplier see photo marked 1 were hobbed, or a special smaller dia gear cutter was used. There may be several ways around my problem, (a) to make a fly cutter tip with the involute form, thus greatly reducing the cutter circumference, the other option is (b) to CNC cut, When the X axis moves along the 12 mm then the? Y axis? will move out 4.386 mm, keeping the point of contact of the cutter circumference constant. I have also machined on the lathe new pinion blanks, making them longer as the other current problem being the cutter hits the collet locking ring even though I am hanging the blanks out of the collet as far as I dare. Once finished with the gear cutting, the blanks will be parted off to length and a square milled in for the chuck key. Photo shows marked 4, a double ended pinion blank, extra long for the collet holder to avoid the cutter hitting the serrated ring. marked as 2 , a aluminium proto before I attack LOL the phosphor bronze, already scrapped one piece, it was to short anyway. Any advise on how to get around this, then always welcome. ? -- John |
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Cover photo changed for May 2024
Added a new cover photo.
ER 40 collet holder body 2 flat wrench, with special handle offset to suit my shop made indexer, I first 3D printed for form, fit, function. Then cut an aluminium made from from 6061 10 mm thick plate using my 4 axis CNC Weiss mini mill. Hope of interest.? -- John |
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Re: Added Folder /100 mm dia aluminium chuck
#file-notice
Forgot to add, the back chip cover 3D printed using carbon fibre impregnated filament.
I recommend this material for clean prints and strength. -- John |
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#CNC
#CNC
Added photos to the file section of the manufacture of a 100 mm dia 3 jaw self centring chuck that is still
WIP. I have to finish the manufacture of the 3 x pinion gears. The body is made from aluminium bar, the internal nose and the spiral bevel gear made from phosphor bronze. All indexing work achieved using a shop built indexer connected by belt to a stepper motor, adopting a CNC approach with a DDCNC control box and g codes. I had two approaches to cut the spiral, by either interpolate ending up with a 2000 line g code,, or a simple 6 line g code. I opted for the second approach.? A very basic See g code below.as the circular table rotates? 360 degrees, the X mill axis moves 6 mm. IE 2 pitches 12 mm 720 degrees, using a 3 mm dia end mill 2 mm deep. Hope of interest. -- John |
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Re: Of possible interest to people with 3D printers and band saws!
Julian and members.
Another method for me to try and produce a tyre by 3D printing for the band saw. My Mastercam program version 8 2002 (old 32 bit ) has the ability to draft a spiral, like a clock spring. All that is needed is to set a few parameters, pitch, number of turns, depth ,origin point etc, Then once on the screen, add an offset for the tyre thickness. From the analyse menu, it will tell me the total length of the spiral generated and adjust preferably a bit longer in the drafting if necessary,? I can produce a butt joint on the ends and then assemble to the wheel with 2 part epoxy. I have attached a couple of photos of me producing a 6 mm pitch spiral for a 100 mm lathe chuck gear which drives the jaw pinions. The Mastercam after drafting produced a toolpath G Code and with the use of a circular table and stepper indexer it did the job. Basically my 4th axis on the converted bench mill CNC. See photos of the hard jaw mating with the scroll., then a bit of final lathe work and it all worked out well. As a prior idiot check, thus saving time and money I? used the same MC8 drafting file? converted it to a STL file and 3D printed in PLA. Now my wife uses this prototype as a flower pot stand, duh but necessity is the mother of invention. LOL I think I will be able to 3D print enough length of tyre for both wheels at the same time, Just basically calculate the final length required x 2 plus a bit extra for lap joints. I?hope photos are self explanatory. Cheers -- John |
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Re: Of possible interest to people with 3D printers and band saws!
Julian
By coincidence this would have been my approach, the good old trusted "jig saw tenon. It worked well when 3D printing that odd shaped box recently. I am not proficient with Fusion but it is installed on my computer, so I can give it a go, thanks for the "how to" do it info. My printer bed is 255 mm x 255 mm, so? I think I could print the tyre in 3 pieces and join together, maybe the 2 sets of tyres needed in one hit. I can always print 1 piece again to a different length if I find my total circumference dimensions are wrong when assembling.? Cheers -- John |
John Lindo