Wizcrafts

That is not a walking foot machine. It is a souped up electronic home machine with an even feed attachment. They are horses of a different color. Your home machines can sew about 1/4 to 5/16" of soft leather, with no larger than #69 bonded nylon thread. The largest needle you can find to fit is will either be a number 18, 19, or 20. It will not properly handle any thread thicker than #69. An industrial walking foot machine can easily sew through 3/8 inch of hard leather, using #138 thread and a #23 leather point needle. Go up to a #25 needle and you can sew with number 207 thread. Industrial walking foot machines are usually triple feed, where the feed dog, inside foot and needle all move in sync. Maximum stitch length is usually 4 to the inch; sometimes bigger. Finally, industrial walking foot machines weigh about 70 pounds and sit on top of a cutout rectangle, with an oil drip pan, in a heavy duty 1.75" thick table, which is bolted onto to a steel frame. There is a very powerful motor under the table, which drives the pulley on the back of the machine head, via a long v-belt. Typically, these motors are rated at about 1/2 horsepower. Most leather workers now use electronic Servo motors, for better control at slow speeds. In contrast, the motor on your souped up home machines will range from 1/10th to 1/15th horsepower. If you persist in sewing 5 layers of leather with your home machine it will have a very short rest of its life.The motor will probably be the first item to go.

Use the left toe harness foot. If you have a blanket foot that came with the machine, grind the right toe off and buff it smooth and use it with the binder. The blanket foot has metal in the middle, inline with the inside foot, which the harness feet lack. This could help feeding the binding onto the leather.

Try CanSew, in Montreal. They have various sizes and colors (colours in Canadian) in size 277 (T270). Most recently, US dealers were able to buy and sell Linhanyl branded nylon thread, from Brazil. Sadly, the US importer apparently stopped stocking it. I don't know all of the details, but Linhanyl is hard to get if you run out. Hopefully, someone else will import their thread, which was available in numerous colors. One could approach thread manufactures based in the USA, such as Coats. They have a minimum order requirement.

The slack in the foot mechanism is within normal operating parameters, as is the slack in the shuttle. The stitch length of 3 mm (8 per inch) maximum should only happen if you try to sew 1/4 inch of leather. Normal maximum stitch length is 5 to the inch, or 5 mm. Are you sure that the stitch length regulator puck is all the way down, with the foot raised? If not, raise the foot with the hand lift lever, loosen the regulator screw and lower the puck until it makes contact with the top of the foot, then tighten the screw down. Make sure that the sliding lift puck on the back of the long spring is moved as far to the right as possible. There is a cutout in the spring in which the puck can slide, left and right. The further left you go, the lower the lift and the smaller the maximum stitches. Make sure that there is enough spring pressure to cause the foot to grab the leather and pull it all the way back. The teeth should not be blunt, or they may slip. You only get long stitches (5/inch) when sewing thin leather; about 1/8 inch or less.

My first industrial sewing machine was a Singer 96k40, which is pretty much identical to your 96k80. I had to convert the feed system to a roller foot and matching feed dog/throat plate, to get it to sew leather. Even then, it maxed out a about 3/16 inch, with only #69 bonded nylon thread. It was okay for sewing a leather vest, but not belts and never holsters or bags/pouches. The feed was inadequate and needle size and stroke were too limited. It is a tailor's machine.

Get you some Schmetz leather point needles and see if they cure the bad loop problem. What size needle and thread are you using right now?

With the foot raised, push and pull on the foot and see if it has measurable play, forward and backward. Make sure that the sliding puck on the back of the head is not too far to the left. That decreases the lift. Most folks set the lift puck all the way to the cutout in the flat spring. Maximum lif gives maximum stitch length. If the torsion spring tension is too low you will have feed problems. Turn down the big screw over the spring on the back. Move the stitch length regulator on the back of the presser bar all the way down, with the foot in the raised position. This yields the longest stitch the machine is capable of. If excessive slack in the foot driving mechanism is to blame, you will need to replace it.

My revolving stop screw looks like it might be a 10-28, 10-32, or 3/16x, with a little more than 1/2 inch of threads. See if you can get a couple of screws with these pitches. SAE thread only.

You can get those parts from Toledo Industrial Sewing Machines.

Dropped stitches are often caused by lifting of the leather, as you are experiencing. The solution is simple: increase the top spring pressure! If your machine is a walking foot machine, and if it has two top springs for the two feet, see if the inside foot has an adjuster for its spring and tighten it down as well. If you adjust the foot pressure springs all the way down and the leather still lifts with the needle, your only recourse is to either use a smaller needle, or a wider presser foot (set) (or run the top thread through silicon or oil lube in a lube pot).

Please retime the machine by retarding the hook a few degrees. If necessary, lower the needlebar to place the loop well into the pickup point, and above the eye. Make sure that you time the machine in forward and reverse, at the same stitch length. Timing is more critical for long stitches than short, when reverse is used. If this doesn't improve the situation, change the path of the top thread so it is more inline than otherwise. Are you using typical left twist bonded thread? Is it coming off the spool easily, or with binding?

I would like to expand on my answers to questions asked about my use of Venture Tape. This is very aggressive double sided tape. It tends to cling to the needles and gum them up. The sticky tape is not too hard to remove by running your fingers down the needle, but watch out for the sharp point at the bottom! The tape does not go away as easily as glue when you slick the edges. Try to stay far enough away from the edges to allow them to be sanded and slicked without hitting the tape. If possible, lay the tape to one side of the stitch line. Walking foot, triple feed machines have less trouble from the tape than say a patcher or straight stitch machine has. I use it on every zipper replacement job, on both sides. It was originally sold to tailor shops as zipper tape. Since then it has been improved to the point that it can hold belts and purses together until you sew them. I love this Venture Tape. When I have to secure large areas, I use either rubber glue (two coats), or spray adhesive. If I have to secure a narrow area that wants to move, I prefer Barge cement.

Yes, the check spring goes between the bottom disks and the take-up lever. It sounds like you need to reduce the travel of the check spring, so the loop forms sooner. Also, change the path the thread takes from the thread stand. Try going through a top hole, around the post, then out the bottom hole, on to the top tension disks. What brand, system and number needles are you using with what thread sizes? Too big of a needle will allow the loops to collapse sooner than otherwise.

Needle getting deflected by the layers of leather and heat from friction? Check spring adjustment (more or less travel)? This affects the size of the loop. Worn pickup point is a definite possible maybe. Does your Adler use spacer shims in the shuttle? If so, does the shim match the needle size? Is there any side slack in the shuttle, that coulds cause the point to miss the loop?

Probably. Place it well inside the edge to be sanded I have sewn through this tape on every machine I have available. It does gum up the needles.

No, I don't know that. All I know is that the supplier has this product labeled as "Leather Tape" by Venture Tape. It works like a charm.

I use Venture Tape, style TPE15, which we get from Wawak, a wholesale supplier for the cleaning and tailoring trade. The tape is sold in 1/4" and 1/2" widths in large rolls. You may need a business ID and tax number to order from them.

Oil the moving cranks attached to the presser bars. If there is a spring on top of the inside presser bar, tighten it down. Tighten the outer foot spring also. Check that the manual lift lever is not binding when you expect it to let go of the raised feet. Check the knee lever to see if it has over traveled and is forcing the feet to stay up.

You won't find any new 441 clones for what you can afford. But, if you look in the Market Place section of the forum, you may find some in the used sewing machines section. Other than that, contact our member dealers who advertise via banners and ask if any of them have a traded-in 441 with the arm length you require.

There ya go, Shooter. We just sold your Boss for ya!

@JimBob; Could be the old gal is worn out from too many stitches. Lift the presser feet and try moving them forward/backward. If there is appreciable motion it will cause reduced stitch length on thick material. If the presser bars are not loose, try reducing the pressure on the top spring (or springs if your machine has two). Eventually, you'll reach a point where you cannot reduce the pressure any further without causing the material to lift with the needle (skipped stitches). A tight bobbin spring will drag the material backwards, especially around corners. Back off the bobbin spring, then the top spring, to balance the position of the knots. If that machine is belt driven check the belt for excessive slack. Finally, check the feed dog for slop and raise it slightly.

I use double sided leather tape, in 1/2 inch width.

I have never heard that term used before. It sounds like a marketing ploy. Walking foot machines are driven by gears, cranks and cams and are made in several configurations, with compound (triple) feed being the best and most popular. No matter which particular system is used, the feet must move in time with the motion of the needle and feed dog. I have published an exhaustive article at the top of this forum, describing various industrial sewing machine drive systems, including some photos. Walking foot machines are covered in depth. I recommend that you read it if you are new to leather sewing machines.

Were you able to lower the inner presser bar, so the foot goes all the way down?

Dan; Why don't you put the Tippmann up for sale in the Market Place > Sewing machines > Used section? Add whatever you get for the Boss to the stash you are holding onto and get yourself a new CB3500? Whatever you get privately will be a lot more than a dealer will pay you for it.