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| is it possible to have a New Type of Automated Electric Guitar |
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| jonovid:
Auto Guitar Project fret shuttle design more complicated than anticipated the automatic guitar got a re-design this project is some what more complicated than anticipated speed and accuracy needed in the fret shuttle's of this musical instrument require an odd direct drive DC motors and leadscrews, as most stepper motors maybe to slow requiring more complexity of design. guitar string spacing will need to be double that of a conventional electric guitar. to accommodate the fret shuttle units with their fret hammer solenoid coils & cable whips solenoid coil dampers will be needed to help note transition as the fret solenoids will act as hammers on the strings. a push up may work better, as this design push's the fret shuttle down on the fretboard meanwhile have a solenoid push up the string. so the string is held in contact with the fretboard through the fret shuttle solenoid. had to reorder, get large sized solenoids for the fret hammers as the gap is 4mm plus push up of the guitar string as 1st set of solenoids was too small to do the job also stepper motors are not the best for the job. too slow |
| tpowell1830:
Enjoy... |
| jonovid:
it's been two years and this AutoGuitar project is proving to be more complicated than ever first anticipated. this is getting to be an expensive musical instrument to construct. here is a rundown of the design plan. changes are made as I go. may have bitten off more than I can chew. but as I now have must of the core components needed, its too late to turn back now. see image. on the left is the timber stained baseplate of the musical instrument. this is a timber door lintel with 4 rubber door stops as feet. at the top of the image is parts of a electric guitar kit so I could research into how electric guitar transducers work. on the right of the image is the 6 x 12vlot DC motors and 6x H bridge motor units to run them . the design calls for many tailor-made components. including 12 inductive bespoke transducers or individual hand wound guitar pickups with magnets. 6 are for sound pickup and the other 6 are input drivers. I am planning for 8 to 16 ohm low impedance bespoke transducers as low impedance hand wound coils are less troublesome to fabricate then high impedance designs. so 3 x LM1897 low noise stereo tape head preamplifiers can be used. and 3 x stereo 2 or 3 watt audio power amplifiers to drive or pluck the guitar strings. the idea is to have this open source musical instrument interface with analog music synthesizer 10 volt output triggers and or arduino midi sequencer. by its two input x6 the Note Hz per channel and drive/pluck strum or bow. to sound it. plus damper the autoguitar fretboard is flat and over it is 6 x 5mm x 400mm ball screws drivan by 6 DC motors that are way overpowered & oversized because the 5mm motor axle diameter most be the same as the 5mm x 400mm ball screws. to avoid complicated machining. so the smallest diameter ball screw that is a full 400mm in length is 5mm. the motor axle must be 5mm also. at a 1 to 1 coupling. another requirement for the ball screws, is the scroll speed. to find notes on the fretboard between pluck or strum inputs. this musical instrument has a wide guitar string spaceing of 20mm string to string and 35mm up off the fretless-fretboard the timber stained baseplate. inbetween the fretboard and the guitar strings are the 6 x solenoid actuator shuttle hammer assemblys that ride the 400mm long ball screws. up and down the fretboard on teflon skids under the guitar strings. so the shuttle hammer pushs up on the guitar string and down on the fretboard. but not on the ball screw axles inbetween. this requires complicated design work for the shuttle hammer assemblys including the cable tracks or cable whips one per channel. that are long springy loops that set up vertical 300mm into the air in-between the guitar strings per channel and loop solenoid wires back to the body of the instrument. also every DC motor has its own optical interrupter on its own axle and re-set switch so the arduino or micro knows where it's at . the only original guitar components are the electric guitar strings or wire resonators and the guitar machine heads or tuning pegs. at the nut end. the baseplate of the musical instrument is a timber door lintel with 4 rubber door stops as feet. as most rubber feet are too small for this. AutoGuitar will sit up 3cm on fat rubber feet and will we be about 1 meter in length, about 25cm of width an about 30cm in height the top of the cable whips. another requirement for the timber baseplate is it must be solid timber as the guitar strings sit up 25mm high off the fretboard so strain rate is increased on the body of the instrument. from both the bridge and the nut ends. research for this musical instrument took me into electric guitar design going back to the 1950s and into 1970s vinyl record cartridges also magnetic tape playback head design. as AutoGuitar is an open source musical instrument. you may have a better design, or tested a better design. at the time I started research into this in 2018 most automated guitars were just robotics clamped on to a standard musical instrument. with problems of guitar string spaceing been way too narrow for most solenoid actuators and the need to push down on the fretboard form above. in addition to this a standard stringed musical instrument is designed for human hands to hold not electronic control systems. automated woodwind instruments is a done thing thanks to 200 yrs of pipe organ technology development IMO so I gave woodwind a miss. but I did look into automating bagpipes. before moving to magnetic guitar technology, been way more versatile. the base electric guitar design is more the 50 yrs old. but its the rich harmonics and overtones that make the instrument what it is. that's all for now! |
| jonovid:
component fabrication takes a lot of time |O motor flanges and the two ends Bridge and Nut saddle flanges. see image. 6 ball screw linear actuators run under the 6 wires. also called the Guitar Strings. once the auto-guitar base is completed then comes the fabrication of the 12 transducers :-/O this where I need to get into the electronics part of the project. by mid 2022 ::) |
| Ed.Kloonk:
--- Quote from: tpowell1830 on September 29, 2020, 09:34:38 pm ---Enjoy... --- End quote --- 50 years ago. :P edit: fixed link |
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