How do you know when it is time to change the needle in your machine?

ReRe

i change my needle after evert project if the project last more than 8 hours change it.

I started using titanium plated machine needles. They last much longer then regular needles. I can machine quilt several big size quilts with one needle. I can tell when the needle goes dull so it's not just a guess on my part. I buy these:

.... Most professionals recommend changing the needle every project or, if you count, every 8 hours. Imagine having a needle that will last 40 to 60 hours. This is equivalent to saving 80% on the cost of needles.....
http://www.superiorthreads.com/shop/...s/description/

Titanium is a good choice. I may have to get some when I run out of my stash.

Sounds like a good idea. Do these work in all sewing machines?

not sure, best to ask your dealer.

I think sewing machines need an hour meter on them. DH is a heavy equipment mechanic & all those big machines get maintenance based on hours in use.

:oops: When the machine starts sewing funky and I can't fins another reason for it :oops:

I used to change them when I broke one - but my BFF taught me the differrence between how the machine sews & sounds when the needle is dull, so now I might start changing them more often than just when I break one - maybe!

I can hear when the needle gets dull or rounded. Sometimes I'm stubborn and don't change as often as I should.