Sorry it took me a day to respond, I was away all day yesterday with no ability to respond.
First I'll say that you don't want any of the current mostly plastic home-use sewing machines, but you have already heard that from others who responded.
I've got two machines. The first machine I got was an early 60's Janome New Home "Dual Duty". My father bought it used maybe 40 years ago for sewing canvas for his boat and it got handed down to me. These are all metal and extremely robust so they have no problem with sewing most canvas projects. The "Double Duty" part of the name is because it was intended as a heavy-duty home/medium duty commercial machine. It's from the era when sewing machines didn't have plastic parts. They just keep on going, they're regularly on eBay and they're a bargain if you're doing canvas work for Jeeps or boats.
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Some of the projects I did with that machine...
A lot of my canvas/leather designs get picked up by Overland Outfitters for production. This HD MOLLE Tailgate Panel is heavy canvas (24 oz.) with leather MOLLE straps and accents. This is the prototype I sewed on the Janome that they later put in production:
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I sewed the roll-up soft sides for my LJ Safari Cab with it. They're made from reused factory soft top fabric and the machine even sewed through the plastic retainer strips the hold the bottom of the panels in place, although the plastic I used was a bit thinner than the plastic the factory soft tops use. The Janome had no problem with the plastic strips or with sewing the windows in place which meant sewing through multiple layers of hem and plastic window material.
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Also made this "covered wagon" canopy for my military replica trailer with the Janome, so large things can be sewn on it too.
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These machines (and similar ones) regularly sell for around $100 on eBay; there's one on there now although it doesn't seem to include the foot pedal. A pedal shouldn't be hard to source:
https://www.ebay.com/itm/2657182596...d=link&campid=5337789113&toolid=20001&mkevt=1
The Janome is a great machine and a lot of Jeep projects can be done with it, but there are some projects it really doesn't have the power to do. My other machine is a Sailrite Ultrafeed LSZ-1, which is a much more powerful machine with a "Walking Foot". I'll explain that... ordinary machines have a presser foot that holds the fabric down under the needle, and a feed dog below the table that moves back and forth to pull the fabric through the machine. The presser foot is stationary and the fabric slides beneath it. This photo from Wikipedia shows an ordinary presser foot (1) and feed dog (2) like the Janome has:
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A Walking Foot has a presser foot that moves back and forth with the feed dog; because of that it can move much heavier fabric through the machine. This video explains:
This is my Sailrite machine:
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It's got a few options, some of which are visible in this photo. First, it's got a heavyweight flywheel (metal wheel on the right side), which really helps sewing in heavier materials. Also it's got a servo motor rather than the standard motor; this is a much more powerful motor which also has a secondary speed control in addition to the speed control offered by the foot pedal. The speed control is the small knob sticking up from the top of the machine, and with it I can slow the machine down to multiple seconds per stitch when I need extreme accuracy and power. I also made an extension table out of Formica that gives me a larger flat surface level with the machine surface, this makes sewing larger things much easier.
As pictured, it's about a $1600 machine, so maybe not something someone new to sewing will buy as their first machine.
Some of the projects I've done with it...
I modified factory soft top sides to roll up. I did this for a JKU but the same technique can be applied to the TJ/LJ factory soft top sides, if people are interested I can post instructions. The reason it took the Sailrite machine to sew these is for sewing through the thick factory plastic retainers at the bottom, the Janome doesn't quite have the power to do that well.
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This spare tire bag is made from factory twill soft top fabric, which is much thicker than ordinary soft top fabric. The Janome would have had trouble with the multiple layers at the seams.
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Similarly, sewing complicated bags from heavy canvas and leather can be hard for a standard machine to pull through, which is where a walking foot comes in handy.
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My recommendation: buy a machine like the Janome to start - it'll do most of the projects you want to do and it's very affordable. It's a great first machine and after you get experience and test the limits of that machine and decide to go further you can buy a used industrial machine or something like my Sailrite. (BTW my Sailrite machine was paid for by royalties from a design a company licensed from me, so maybe you'll be able to fund some of your your sewing that way
).
Also I'll second the recommendation from
@Fulton_Hogan - get to know the Sailrite web site, they have lots of instruction videos for both beginners and more advanced subjects (like how to sew windows into canvas). They also have many supplies you'll want, like the Seamstick basting tape he mentioned.
Finally I'll say that I'm happy to offer any advice and guidance you might need as you get into sewing. I've done many Jeep-related projects, many of which have become commercial products, so if my experience can help you just ask.