Questions about my new Pfaff 1245

[katit]

Spent couple hours just looking at all parts, sewing some, etc. Many questions came up..

1. I want to clean it. See picture with white wrinkled surface. Dirt in low spots. I tries to soak with contractor solvent(similar to goo gone) and use tooth brush but no luck. Any suggestions? I think if I can clean it - machine will be like new..

2. Servo motor. I was practicing and trying to go really slow. Sometime it works, but pedal travel is not relative to speed. Example, 30-40% of travel nothing happen and then 10% of travel it moves slowly and then it just goes fast. I wonder if there is something I can do to make it gradual? Changing speed on servo control just "moves" this grab point and makes top speed lower/faster

3. Bobbin casing. There is some dirt/gunk inside. I'd like to clean but not sure if it's possible to take hook assembly out without kicking it off alignment?

4. Machine missing all "Crucial" parts  In manual it says don't run without needle guard, don't run without this guard over this up/down thingy (not sure what is the name) and don't run without belt cover. All those missing. I found part numbers for them. Any common online supplier for those?

5. Walking foot. It is not flat on a bottom. I afraid it might mark leather. Which one do I need and any other feets I need to get for this machine? Will be working on automotive upholstery.

Thanks a lot!

 

 

More pics:

 

[dikman]

Those "crucial parts" aren't necessary to run the machine, they're simply there to meet the manufacturer's legal safety obligations. Unless you're really concerned (or paranoid about safety) I wouldn't worry about them.

Maybe you could try a rag dampened with WD40 to clean it?

Personally, I'd try and clean as much from the bobbin case as possible without dismantling it - unless you're very mechanically minded and know what you're doing!

As for the feet, you could grind them flat or try filling the grooves with JBWeld. Kwok Hing is one supplier of feet for some Pfaff machines.

Sewing speed, perhaps consider fitting a speed reducer?

[katit]

"Crucial parts" was quoted to indicate their "importance". But I got nice machine and I figured it would be nice to have it complete. Of course I don't really care about those parts. Belt cover (front piece) is kind of bothers me cosmetically

WD40 doesn't work

Just took motor pulley off - it's 75mm and 15mm inside. Found same one but 45mm on eBay, let's see what it does. Should give more torque which is what I need. When I press pedal half way even though it's not sewing if I crank by hand it goes much easier. So, it's just motor can't overcome resistance. And seller said putting on low speed won't help. If I will work with leather it just won't start.. I hope 45mm pulley will help.

Another question about servo motor: Should they squeal? When I turn machine by hand I hear this squealing noise. I though maybe it's belt skipping. But now I had pulley off and turned motor and it's motor itself. When it turns over under power - no problem. But it's very annoying when you do this last stich or try to raise needle it makes this horrible sound.

 

[R8R]

I cleaned up an old Juki with some Lysol hydrogen peroxide cleaner, a small nylon brush and some good microfiber towels. You have to scrub the gunk out of the "pores" of the textured paint.

http://www.lysol.com/products/see-all-products/lysol-with-hydrogen-peroxide-multi-purpose-cleaner-citrus-sparkle-zest/

It came from a very, very dirty factory and by the time I was done it looked new.

 

One of those 550w servos with no speed reducer is great for upholstery or garments, but it won't have much low speed torque, and it will need speed and momentum to penetrate anything substantial. A smaller pulley on the motor will help, but a reducer will make all the difference.

Edited October 13, 2018 by R8R

[R8R]

Oh and the hook just soak it in sewing oil and scrub with a toothbrush or similar soft brush till clean, then rinse in more oil. Avoid solvents as they can stick around and reduce the effectiveness of any lubrication from the oil.

[katit]

25 minutes ago, R8R said:

 

One of those 550w servos with no speed reducer is great for upholstery or garments, but it won't have much low speed torque, and it will need speed and momentum to penetrate anything substantial. A smaller pulley on the motor will help, but a reducer will make all the difference.

Can you point me to speed reducer? Can’t find what it is

thank you!

[R8R]

3 minutes ago, katit said:

Can you point me to speed reducer? Can’t find what it is

thank you!

It is a large-to-small pulley reduction wheel. Typically made of iron.

This is one of the ones I have:

https://store.keysew.com/parts/sewing-parts/sr-2

Many (most) industrial sewing vendors sell them.

It bolts under the table between the servo motor and the machine. You then have a two belt power transfer - one belt from the small pulley of the motor to the large pulley of the reducer, then one belt from the small pulley of the reducer to the pulley on the machine.

This adds torque and slows the machine to a stitch-by-stitch crawl.

Trade off is it adds complexity and can be tricky to set up, and can make tilting the head back a chore if you have to undo the belts.

[katit]

Ok, I see. And it’s pretty expensive. I will see what 75->45mm pulley will do. Maybe practice and exchange will fix it for me

[Constabulary]

sample for a DIY speed reducer:

 

[katit]

Yep. I can do that. Problem with missing belt cover will be solved automatically as I will have to take other one out as well