Pfaff 335-H3 With Efka Variostop Moto And Air

[Trox]

Hi Tor

I did get my order. I deal with Michael Ko. spareparts@kwokhing.com

He has been very good in responding to my emails and getting my order processed and delivered.

Keep trying.

Yes the Indian site is abit difficult to understand. I emailed them but haven't got a response yet.

Marjan

Hi Marjan, thank you. I use to deal with Bosko Ko, seams like he is family. Perhaps his not around anymore, It was a personal email: bosko att kwokhing dot com (anti spam display format). I will try the other email.

Thanks

Tor

[Charles1]

What thickness of leather can you sew?

The way in which Pfaff designates its machines is rather confusing to me - particularly with respect to the designation of H2 vs. H3 machines that bear the designation B vs. C.

The H3 means it is a normal lift. H4 means high lift -meaning the feet would lift higher for more clearance under the feet. The "B" means it is a B class. C is heavier than a B class, C/D is heavier in sewing capabilities than C, etc. The D class was the heaviest model in the 335.

Given the fact that this thread is a bit old and it is about a Pfaff 335 machine, and the fact my question applies more broadly to the model designation of other Pfaff machines as well, I have deleted the detailed question from this thread, and started a new thread that deals with the thickness of leather that Pfaff H3 machines can sew ("What thickness of leather can a Pfaff H3 "B" machine sew? ")

.

Edited May 9, 2015 by Charles1

[shoepatcher]

A 335 can normally sew about 3/8" of leather. It also depends on the type of leather. Whether a n H2, H3 or H4, that will dictate how high the feet lift. H2 and H3 are about the same with a 11mm foot lift. The H4 is about 14 mm of lift. Class indicates the balance wheel size, size of the needle hole in the feed dog and sometimes the heaviness of certain links and parts inside of the machine. D class will have the biggest balance wheel diameter and the largest needle hole size in the feed dog.

Your H3 will have 11mm of lift. The B class will have the smallest size diameter on the balance wheel. The smaller the balance wheel, the less torque you have on the needle penetrating the material.

My best advice is to test sew the machine.

Again, the letters and numbers mean:

H is lift on the feet of the machine H4 is the high lift version

B, C, C/D and D is most of the time diameter of the balance wheel, size of needle hole, heaviness of certain internal parts

P 4 motion drop feed

N maximum stitch length of 6mm

L for leather sewing

S for sewing cloth

M safety clutch although it may have it without the letter M on the plate

Hope that helps.

glenn

[Charles1]

A 335 can normally sew about 3/8" of leather. It also depends on the type of leather. Whether a n H2, H3 or H4, that will dictate how high the feet lift. H2 and H3 are about the same with a 11mm foot lift. The H4 is about 14 mm of lift. Class indicates the balance wheel size, size of the needle hole in the feed dog and sometimes the heaviness of certain links and parts inside of the machine. D class will have the biggest balance wheel diameter and the largest needle hole size in the feed dog.

Your H3 will have 11mm of lift. The B class will have the smallest size diameter on the balance wheel. The smaller the balance wheel, the less torque you have on the needle penetrating the material.

My best advice is to test sew the machine.

Again, the letters and numbers mean:

H is lift on the feet of the machine H4 is the high lift version

B, C, C/D and D is most of the time diameter of the balance wheel, size of needle hole, heaviness of certain internal parts

P 4 motion drop feed

N maximum stitch length of 6mm

L for leather sewing

S for sewing cloth

M safety clutch although it may have it without the letter M on the plate

Hope that helps.

glenn

Glenn:

Thanks, immensely for the prompt and very useful guide to the codes on the Pfaff machine model plate.

Since I do not intend ot use those machines to sew 3/8", an issue might arise only in areas where seams overlapped - and experience will tell what the machine can do.

Even so, I wonder if you can give a few more clarifications - just to satisfy my curiosity if I do approach the limits with the 335 H3 and 195 H3 "B" machines when sewing some types of leather that have not been a problem on my 545 H3 "C".

I'm asking because I have recently acquired a 335 H3 "B" and a 195 H3 "B" to use in conjunction with the 545 H3 "C" machine.

What is the maximum needle and thread size? Is it different on the "B" and "C" machines?

If the "C" machines can use heavier needles and thicker thread, can you modify a "B" machine - say by putting a larger wheel on the machine or by using a speed reducer (to increase the torque) - and by increasing the size of the needle hole in the feed dog (and repositioning the hook if necessary), so that the "B" machines will accommodate the same needl and thread and the same thickness of material as the "C" machine will handle?

Is there much of a risk that by pushing the "B" machine towards the performance of a "C" that you would damage to the internal parts of the "B" machines that have been replaced with stronger parts in the "C" and "D" machines?

Can you reduce or eliminate the risks when you push a "B" machine to sew what you really should be using a "C" machine to sew ... by sewing very carefully and at a much slower pace in those circumsttances where you might be approaching 3/8" inches in particularly hard leathers?

I know that it will require just getting on with it and seeing what will work, but guidance as to the potential pitfalls would be helpful.

Thanks.

Charles

Edited May 9, 2015 by Charles1

[shoepatcher]

Charles1,

-only difference between a "B" and "C" machine should be size of balance wheel, needle hole size in feed dog and maybe in the linkage. Needle holes in feed dogs can be enlarged with a Dremel and Mitchell cord. No big deal. I would say the maximum thread size would be #207 on top, don't use in bobbin. Needle size would be #24 and you will have to check needle hole size in feed dog.

-You can run larger needles in a "B" machine but again, the needle hole in the feed dog may have to be enlarged. I have done this a lot. it is no big deal.

-Pushing the "B" machine to sew heavier is not a big deal so long as you stay to a maximum #24 needle and #207 thread on top, #138 on bottom.

-You can put a bigger balance wheel on a "B" machine. I did it on a Pfaff 1295 post machine we have at work.

-As I stated earlier, you can sew heavier things on a "B" machine. Just watch what you are doing. The machines will handle it in most cases so long as you do not

go overboard it what you are attempting to sew.

glenn

[Charles1]

Glenn:

Thanks, immensely. That's what I needed to know - and what I was hoping to hear.

Charles