Cobra class 3 and 4 Skipping stitch on thick leather

[fallequinox]

Wondering if anyone else has this problem.

When I stitch somewhat thicker leather sheaths my machines (Cobra class 3 and class 4) are skipping stitches. This does not seem to happen when the leather being stitched is somewhat thin. 

Any tips or troubleshooting advice appreciated. 

[Wizcrafts]

First, tighten down the presser foot pressure spring. Most skipped stitches are caused by the leather lifting up with the ascending needle and that spring holds it down. Install a new needle, in case the old one is damaged in some way. Alternately, try using one size larger needle as a larger hole makes it easier to pull up the knots inside the leather without lifting it.

If these suggestions don't fix the problem, your timing may be off and will need tweaking. The problem may be the needle bar moved from impacts, or worse, the hook has become retarded from thread jams. Try the first suggestions before dinking with the timing.

[fallequinox]

18 minutes ago, Wizcrafts said:

First, tighten down the presser foot pressure spring. Most skipped stitches are caused by the leather lifting up with the ascending needle and that spring holds it down. Install a new needle, in case the old one is damaged in some way. Alternately, try using one size larger needle as a larger hole makes it easier to pull up the knots inside the leather without lifting it.

If these suggestions don't fix the problem, your timing may be off and will need tweaking. The problem may be the needle bar moved from impacts, or worse, the hook has become retarded from thread jams. Try the first suggestions before dinking with the timing.

Thank you. I will give it a shot. The leather is indeed lifting on the upswing. 

[fallequinox]

6 hours ago, Wizcrafts said:

First, tighten down the presser foot pressure spring. Most skipped stitches are caused by the leather lifting up with the ascending needle and that spring holds it down. Install a new needle, in case the old one is damaged in some way. Alternately, try using one size larger needle as a larger hole makes it easier to pull up the knots inside the leather without lifting it.

If these suggestions don't fix the problem, your timing may be off and will need tweaking. The problem may be the needle bar moved from impacts, or worse, the hook has become retarded from thread jams. Try the first suggestions before dinking with the timing.

This helped quite a bit. We got through the day. Thank you!

[Wizcrafts]

4 hours ago, fallequinox said:

This helped quite a bit. We got through the day. Thank you!

Glad to help a fellow Michigander!

[TonySFLDLTHR]

On 10/9/2019 at 12:44 PM, Wizcrafts said:

First, tighten down the presser foot pressure spring. Most skipped stitches are caused by the leather lifting up with the ascending needle and that spring holds it down. Install a new needle, in case the old one is damaged in some way. Alternately, try using one size larger needle as a larger hole makes it easier to pull up the knots inside the leather without lifting it.

If these suggestions don't fix the problem, your timing may be off and will need tweaking. The problem may be the needle bar moved from impacts, or worse, the hook has become retarded from thread jams. Try the first suggestions before dinking with the timing.

This is perfect advice for anyone having that skipped stitch! Thanks Wiz!