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Sewing Machine Modifications

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Will_D:

--- Quote from: efrench on March 26, 2019, 02:03:02 AM ---This thread makes me want to open up my wife's Bernina :D

--- End quote ---

Its a good job we don't have dirty minds on this site!  :jaw:

Will

S. Heslop:
Picked another machine up.


A Singer G105, made in Brazil. No idea what year it was made. If it was a GUN then i'd have endless books, resources, and teams of 'historians' to reference the serial number against - with detailed histories of every engineer involved in its development along with the specific factories that were subcontracted for each part. But alas this machine wasn't made to kill people.


It's got a drop in bobbin and a rotary hook.


Plastic gears. The lid was tricky to take off, requires flexing the plastic to clear it over stuff, which is rather odd. It's also clogged with a very sticky and viscous grease that makes some things hard to move.


This is one feature i'm not too keen on, for my purposes. A tilting needle bar rather than the swinging kind. It'll make it harder to add a needle threading hook.

The take up lever is slotted. Although oddly on the machine as is it never raises high enough to clear the cover, making it somewhat useless.


This is what I was after, and wasn't sure if this machine would have. A belt driven hook. That should make it alot easier to extend the bottom!


So the frame itself seems to be made out of zamak, as far as I can tell. It's heavy and grey but doesn't ring like cast iron. Very dull sounding when tapped. Doesn't scratch easily either. It seems theres a good spot to cleave the head though that'll have room for a few screws, which is a relief since soldering it sounds tricky.

Cant wait to hack saw through all that zamak!

S. Heslop:
I've got some corrections to make! Firstly I didn't intend that as a dig at the firearm guys, I just wish other types of machines got as much enthusiasm. Also I'm not sure why I thought the thing would be cast from zamak, it's clearly cast iron. It just sounded duller than usual till all the stuff was taken off. And lastly I think you could thread into that slotted take up lever, just not when the needle is in the up position.

I've now got this mostly pulled apart.



Here's all the stuff i'm keeping.


And here's a close up where I think would be best to cleave the head.


There'd be enough casting there to get a few screws in.


I'll have to take some measurements next so I can figure out how to to build the frame.

mattinker:
Wouldn't a diagonal cut work better?

Just a thought, regards, Matthew

S. Heslop:

--- Quote from: mattinker on March 29, 2019, 06:16:58 AM ---Wouldn't a diagonal cut work better?

Just a thought, regards, Matthew

--- End quote ---

I think the square cut would be easier to align. But it does mean i'm going to be cutting through more stuff this way.


Spent the last few days measuring all the important points and trying to design the new frame. Here's what i've got so far.



Bit of a jumble but i'm trying to make use of the material i've got. I think i'm good for everything but the zig-zag mechanism now.

The way that seemed easiest to me would be to copy what the computerized machines do, and have a stepper motor move the needle bar. But i'm aiming for about 1200 stitches per minute and i'm not sure if the average nema 17 would keep up with that...

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