GisserD Posted January 8, 2020 Author Share Posted January 8, 2020 Pickups ordered today. Changed my mind and went for a nordstrand jazz and mm combo. Not blades as previously intended. Design has been progressing, I'll publish some more ideas soon. 1 Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 9, 2020 Author Share Posted January 9, 2020 Babicz Bridge and Nordstrand 3B-5B Preamp now aquired. Quote Link to comment Share on other sites More sharing options...
mixingwithtom Posted January 14, 2020 Share Posted January 14, 2020 This sounds interesting, hope it’s going well! Wondering which CAD programme you are using? Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 14, 2020 Author Share Posted January 14, 2020 4 hours ago, wwcringe said: This sounds interesting, hope it’s going well! Wondering which CAD programme you are using? Siemens NX Quote Link to comment Share on other sites More sharing options...
mixingwithtom Posted January 14, 2020 Share Posted January 14, 2020 I’m not familiar with it, but cool! Best of luck & can’t wait to see more Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 14, 2020 Author Share Posted January 14, 2020 (edited) NEW BODY SHAPE! the idea was to give more access to the upper frets and make the lower horn more synpathetic to the shape of the upper horn which i like. (old one for comparison in lilac) Edited January 14, 2020 by GisserD 2 Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 14, 2020 Author Share Posted January 14, 2020 2 Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 15, 2020 Author Share Posted January 15, 2020 Parts starting to arrive now (Nordstrand 3band pre in the box) 1 Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 15, 2020 Author Share Posted January 15, 2020 some developments today in the moving pickup design... 2x Multi start screw with thumb wheel at each end to move pickup shuttle. 1 revolituon wil be 8mm travel. im considering moving the entire mechanism to be actuated from the back of the bass for better acces, however it then opens up the opsibility of it moving unintentionally. 2 Quote Link to comment Share on other sites More sharing options...
SpondonBassed Posted January 15, 2020 Share Posted January 15, 2020 What sort of linear bearings will the shuttle run on? I'm assuming plain from your diagram. Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 15, 2020 Author Share Posted January 15, 2020 Bearing? There are no loads involved so I think bearings are unnecessary. The shuttle actuates through a T slot in the front body panel. To stop it falling out but even that isn't strictly necessary. What isn't shown in those pics is a housing on the back of the shuttle that will encapsulate the nut that runs on the screw. 1 Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 15, 2020 Author Share Posted January 15, 2020 (edited) Got home. Had a glass of wine and upon reflection, I now think this pickup actuation design is overengineered. There is a far simpler solution. And it takes up less space. And it's cheaper. No vibrations, allows more movement. And quicker to move the pickup. A simple recessed thumb screw through the body, securing the shuttle from the back. Edited January 15, 2020 by GisserD 3 Quote Link to comment Share on other sites More sharing options...
SpondonBassed Posted January 15, 2020 Share Posted January 15, 2020 19 minutes ago, GisserD said: There are no loads involved so I think bearings are unnecessary. Then what finish will be on the surface that the shuttle slides upon? I'm just thinking that a single screw thread might allow the shuttle to bind with some finishes if it is even slightly out of alignment with its guide channel. Twin screw threads would help but they would also ruin a simple and effective idea because they'd have to be connected so as to turn in unison. Quote Link to comment Share on other sites More sharing options...
SpondonBassed Posted January 15, 2020 Share Posted January 15, 2020 5 minutes ago, GisserD said: A simple recessed thumb screw through the body, securing the shuttle from the back. I like that a lot better. Simple = reliable and easy to fix if things go wrong. Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted January 20, 2020 Share Posted January 20, 2020 How about securing plastic shuttles with magnets? As you might imagine, it's easier to slide magnets across the surface they're stuck to than pull away perpendicular to the surface. Quote Link to comment Share on other sites More sharing options...
GisserD Posted January 21, 2020 Author Share Posted January 21, 2020 Nice idea. But I'd need some pretty strong magnets on the other side of the 8mm aluminium to make that work as ally isn't magnetic. And I'm not sure how that would affect the pickups at all.... Quote Link to comment Share on other sites More sharing options...
Maude Posted January 24, 2020 Share Posted January 24, 2020 Could some sort of cam lever arrangement be used for locking the sliding pickup? Two rails could still be used to stop any twisting motion making the pickup snag when sliding, but only one need have the cam lock. Lift the lever to release, slide the PU and push the lever down to lock. Similar sort of thing to quick release bike spindles. 1 Quote Link to comment Share on other sites More sharing options...
itu Posted January 25, 2020 Share Posted January 25, 2020 Cut half of the longitudal (?) thread away from the nut and the screw and you can lock the pickups with just a half turn of the screw. Like the locks in cannons. See "stepped thread", "breech screw" etc. Quote Link to comment Share on other sites More sharing options...
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