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-   -   Accurate rotary cutting on cutting mats.. can you help me? (https://www.quiltingboard.com/main-f1/accurate-rotary-cutting-cutting-mats-can-you-help-me-t61113.html)

janquilts'ncrochets 08-25-2010 08:47 AM

I beleive it was Leah Day's site that I saw when cutting use the full line included in your measurement. That includes both sides. Haven't tested it, but I have wondered about this for years myself.

janquilts'ncrochets 08-25-2010 08:56 AM

Just read my reply to you & wasn't very clear in my answer. I should have said the lines on the ruler, not the matt. Many others said not to use the matt for measuring I completely agree.

janquilts'ncrochets 08-25-2010 08:56 AM

Just read my reply to you & wasn't very clear in my answer. I should have said the lines on the ruler, not the matt. Many others said not to use the matt for measuring I completely agree.

AnitaSt 08-25-2010 11:02 AM


Originally Posted by Bobbin along
I turn my mat to the blank side, then square up the edge i plan to cut from. I take a ruler and lay it somewhere near where i think I will be making the cut, Then i take a smaller ruler, lay it perpendicular to the other ruler on the fabric, and measure over from the cut edge to the bigger ruler to get the exact measurement. check the measurements up and down the edge ("measure twice, cut once") and cut along the big ruller. Don't know if that makes sense or not, but it is a lot more accurate than using the line on the mat. Good luck!

Ditto this process...use the back of the mat. It forces you to actually measure and square the fabric itself.

madamekelly 08-25-2010 12:58 PM


Originally Posted by bearisgray

Originally Posted by kapatt
I just wanted to add that when you sew on your quilt, you should first do a test-strip to make sure that your settings on your sewing machine, your cutting and your pressing are accurate. To do that, you should cut two or three pieces of strips equal width, sew them together and then press them. See if the test strips come out at the right width. If they don't, then make the adjustments you need to make so that they are accurate.

Example...take three 2" strips and sew them side-by-side. After ironing they should measure out to 5 1/2 inches wide.

Because of all of life's happenings, it can take me forever to finish a quilt. I make periodic test-strips throughout my quilt making process just because the settings can be messed with or changed without me realizing it.

I think one would be aiming for a five inch wide piece, not a 5.5 inch piece.

Gotcha! Now I know who to ask for math help....:)

chamby 08-25-2010 02:20 PM

I use both the mat and the ruler. If the block is 6.5 or smaller I use the ruler mainly which also lines up with the lines on the mat. If the block is larger I use the mat and use the ruler for the straight edge for cutting guide. I really have not had any problems since doing this method.

jayelee 08-25-2010 02:52 PM

My carpenter brother says you would line up at the edge of the line not on it or over it Because that is a question I have often asked Otherwise you will eventually get significant measurage added He explained that if I were to cut 100 one inch strips and sew them together I would probably end up with up to 5 inches extra in measurement

JustBonnie2 08-25-2010 04:00 PM

I only use the mat and have never had a problem. I think because I use the mat ALL the time, it comes back to that consistency thing. I don't know how you would cut a 15" square or an 18" square without using the lines on the mat. I don't have a ruler that big! I think one thing everybody said is right - - BE CONSISTENT!

Phyllis nm 08-25-2010 05:20 PM

it depends if you are right or left handed. be consent.

Suzy 08-25-2010 05:25 PM

I always make sure the thickness of the line on my ruler is completely on my fabric, not just to the edge of fabric but on the fabric. Does that make sense?

Suzy

ccthomas 08-25-2010 05:35 PM

I can so relate to all "life's happenings" and "forever to finish a quilt." I thought I was the only one.


Originally Posted by kapatt
I just wanted to add that when you sew on your quilt, you should first do a test-strip to make sure that your settings on your sewing machine, your cutting and your pressing are accurate. To do that, you should cut two or three pieces of strips equal width, sew them together and then press them. See if the test strips come out at the right width. If they don't, then make the adjustments you need to make so that they are accurate.

Example...take three 2" strips and sew them side-by-side. After ironing they should measure out to 5 1/2 inches wide.

Because of all of life's happenings, it can take me forever to finish a quilt. I make periodic test-strips throughout my quilt making process just because the settings can be messed with or changed without me realizing it.


GloBug 08-25-2010 05:38 PM

I do not use the lines on the mat for cutting,only for lining the straight edge. I always measure with the same ruler { twice } then cut.
Good Luck :-)

dgrindey 08-25-2010 05:45 PM

This has been a problem for me as well. I am always struggling with it so the owner of the fabric shop I go to told me just to be consistent with where you are placing the ruler, whether you follow the ruler lines or the mat lines. I still have problems.

GloBug 08-25-2010 06:12 PM

I found for me the trick was measuring twice, then cutting. I think I got this trick from my late husband. He did finished carpentry.
Also check your seam allowance often. One of my favorite machines is from the 70s and the pressure foot works loose.
Happy sewing
GloBug :)

Gerbie 08-25-2010 08:21 PM


Originally Posted by sewhappy30
My question... When cutting on my mat, the line's are thicker than my rotary blade of course, so after I have everything lined up do I put my ruler on the line or on one of the sides of the line to get the accurate measurement I need.

I find myself doing different each time, that's why my measurements are off I'm sure.

I know this is probably not clear what I'm trying to ask, but if someone understands and knows which way is accurate please tell me.

For example: If I need to cut it 15", which way would be the most accurate to get that? On the 15" line or on the side of the line, and if on the side, which side right or left?

This is something I've struggled with for a long time. If I knew the right way to do it, it would make my sewing life so much easier. Help!




I know exactly what you mean, I hope I can explain it to you the way I do it.
I don't use my mat for cutting, I use my ruler. I was getting mine a little off when I would line the ruler up and cut. I finally figured out what I was doing wrong or at least it seems like it was wrong for me. when I watched a friend cut fabric. She used her ruler and lined the edge of the fabric up with the right side of the ruler line and then cut.If that makes sense to you I was always placing the line of the ruler on the edge of the fabric so that the line was exactly on the edge, but now I place it to the edge and then cut on the outside or right of the line just the width of the lines has made a difference in my measurements. I find my measurements are more accurate than before. I hope this makes sense. I don't know how to post pic. yet or I would post a pic. and show you what I mean. Gerbie

jacqstash 08-25-2010 08:30 PM

I also use the back side of the mat and rulers from the same manufacturer (except for specialty rulers). This stops me from using the lines on the mat and is much less distracting when the mat is just a solid color! The first time I heard of doing this was when I took a workshop with Kaye England - and my cutting has improved a lot.

Boscobd 08-25-2010 08:53 PM


Originally Posted by JustBonnie2
I only use the mat and have never had a problem. I think because I use the mat ALL the time, it comes back to that consistency thing. I don't know how you would cut a 15" square or an 18" square without using the lines on the mat. I don't have a ruler that big! I think one thing everybody said is right - - BE CONSISTENT!

I agree. I have always used the mat and have never had an issue. Consistency is the clue.

penski 08-25-2010 10:23 PM

i have always used the mat and used thr ruler to cut and have never had a problem

Annya 08-26-2010 01:59 AM

If you HAVE to use your mat make your measurement on the outside of the line. On the ruler do the same OUTSIDE that will give you a more accurate measurement. I myself would never use the mat as the lines are not always straight.

Annya 08-26-2010 02:04 AM

I think it should be 4.1/2 inches not 5 or 5.5

mawmawbeve_60 08-26-2010 02:31 AM

Yes, I use the lines on the mat for the fabric, but use my rulers to make accurate cuts....and I use 2 rulers for that..one length ways and and horizotal...measure both ways top ,.bottom and middle...and seen your From Charleston WV..I Live In Wayne county WV...good meeting a fellow WVirginian.....lol

bearisgray 08-26-2010 04:51 AM

I've learned to check rulers with other rulers. And the grids on cutting mats and the grids on ironing board surfaces.

Graph paper is also sometimes "off" and I check/measure it both ways before I will use it for a pattern/template.

chamby 08-26-2010 07:19 AM


Originally Posted by JustBonnie2
I only use the mat and have never had a problem. I think because I use the mat ALL the time, it comes back to that consistency thing. I don't know how you would cut a 15" square or an 18" square without using the lines on the mat. I don't have a ruler that big! I think one thing everybody said is right - - BE CONSISTENT!

DITTO

Judie 08-26-2010 07:40 PM

Don't use the lines on the mat.. use the lines on your ruler.. they are much more accurate.. I have used the mat lines a few time for pieces that were too wide for my ruler.. but hardly ever.. jut too hard to get what you want!! Turn the mat over and forget the lines!

grayladym 08-28-2010 02:17 PM

If you use the "wrong" side of your cutting mat, the side without the lines, you'll find instant improvement. Rely on your ruler(s) alone, you'll have fewer problems. I have always known this, but if using the ruled side, I invariably start to follow the mat lines. It will cause me problems every time.

grayladym, Missouri

pegquilter8 08-29-2010 07:52 AM

I agree, use your rulers. Also use the same brand of rulers for each project. The makers of each brand mark electronically and same brand made to work with same brand----for most accurate cuts. I do not use the lines on mats.
I use my rulers to square cutting from R to L if L hand, or L to R if R handed. Hope this helps. Been teaching for 22 years now and this is how I always teach my new quilters.
Hope all this helps

Annya 08-29-2010 02:17 PM

Early this year an instructor came to show us how to use our quilting tools and she said that every company has their own way to mark the rulers and that we should all have rulers from the same company. BUT you must check and make sure the lines are all the right distance apart and that the lines are straight. She told us of one lady in a class she was teaching who was having problems,so the teacher checked the new ruler(Bought for this class) and found the lines on the ruler were all over the place hence the problems. With this I like to let EVERYONE know the story and ask you 2 things. Make sure all the rulers are from the same place and check to see if they are measuring the same and and are straight.

Annya 08-29-2010 02:17 PM

Early this year an instructor came to show us how to use our quilting tools and she said that every company has their own way to mark the rulers and that we should all have rulers from the same company. BUT you must check and make sure the lines are all the right distance apart and that the lines are straight. She told us of one lady in a class she was teaching who was having problems,so the teacher checked the new ruler(Bought for this class) and found the lines on the ruler were all over the place hence the problems. With this I like to let EVERYONE know the story and ask you 2 things. Make sure all the rulers are from the same place and check to see if they are measuring the same and and are straight. Also the rulers with the THINNER lines are the best.


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