Uploading programs, what's the difference in save levels?

[Underdog]

What's the difference in save levels (normal, best, optimum etc.) when uploading programs to the card?

Feed speed?
Spindle Speed?
Stepover?

[fwharris]

You can look at it as the same with printing on your printer. Draft will give you the fastest but with lower quality and as each setting is used the longer it takes with better quality..

[Underdog]

I want specifics. I know the quality is different. That's pretty obvious.

I want to know specifically what CW does that makes the difference between those save levels. Is it the stepover? Is it the feedrate? What?

[Underdog]

OH come on! Nobody knows?

Surely someone has asked this question before....

I want to know what improves the quality from "draft, normal, best, and optimal".

Connie? Somebody? Anybody?

[mtylerfl]

...

I want to know what improves the quality from "draft, normal, best, and optimal".

Connie? Somebody? Anybody?

I think this was already answered about a year or two ago, but didn't do a search.

The stepover of the bit is primarily what makes the quality differences...the larger the stepover, the worse the quality. The smaller the stepover, the better the quality. Feedrates can vary and there are other factors that determine quality as well. I've never asked what the feedrates are (nor bothered to measure/time them with any degree of accuracy myself) for each quality setting.

Here's the scoop...

Draft X (1/96") Y (1/100")
Normal X (1/128") Y (1/100")
Best X (1/192") Y (1/100")
Optimal X (1/256") Y (6/1000")

Z is always 1/128"

I did do a few carving tests between the CW and the ShopBot quite awhile ago to get an idea of comparible quality of the CarveWright settings vs percentage stepover settings for toolpathing on the Bot. This is not scientific by any means, but simply based upon crude and casual visual observation on my part.

CW Draft gives pretty much the same appearance of a 17% stepover on the Bot

CW Normal gives pretty much the same appearance of a 13% stepover on the Bot

CW Best gives pretty much the same appearance of a 8% stepover on the Bot

CW Optimal gives the same appearance of a 6% stepover on the Bot

[lynnfrwd]

I think the answer is yes to all three, but I don't know specific numbers.

Rawls could probably find the numbers, but I don't think he keeps that info fresh on his brain.

[lynnfrwd]

MT beat me. Good job.

[Digitalwoodshop]

I want specifics. I know the quality is different. That's pretty obvious.

I want to know specifically what CW does that makes the difference between those save levels. Is it the stepover? Is it the feedrate? What?

"You can't handle the Truth !!!".... Just kidding... What movie was that...

Honestly don't know.... Couldn't resist....

AL

[lynnfrwd]

Tom cruise jack nicholson Demi Moore.
Can't come up with the name either.

[55president]

This is in keeping with my measurements -- I counted the passes in a test carve of a 1" square -- the x stepover was 96 passes for draft,
128 passes for normal, 192 passes for best and 256 for optimal, I had no way of measuring the y axis travel except for time and
it seemed that reamained constant. But I will double check and see if my time ratings are different.....

Hope this helps...

FXP

[55president]

A few good men (and one great woman).

[55president]

Oh here is the info:

Draft 54 seconds 96 passes = 96 inches ==.5625 inches per second
Normal one minute 11 seconds 128 passes=128 inches ==.5546 inches per second
Best one minute 50 seconds 192 passes= 192 inches ===.5729inches per second
Optimal three minutes 37 seconds 256= 256 inches passes--==.8476 inches per second

I did these tests a while back but I put the info down and I remember now, the first three are pronably the same feed rate for the y ( around .5625 in/ second) , because they are so close, and the optimal seems to have a slower feedrate for the y.
These tests are simple to do, try them for your self...


FXP

[55president]

These vary are of course appoximate as I was doing this with the timer on my iphone.

FXP

[55president]

sorry wrong results :

this is the correct results for the 1x1 1/8 deep test :

cutting a 1x1” test square



Draft 54 seconds 96 passes = 96 inches ==1.7777 inches per second
Normal one minute 11 seconds 128 passes=128 inches ==1.802 inches per min
Best one minute 50 seconds 192 passes= 192 inches ===1.74 inches per min
Optimal three minutes 37 seconds 279= 256 inches passes--==1.036 inches per min


sorry

FXP

[Underdog]

Thanks! Great information. So if we do that math... 96 passes per inch is .010" stepover, 128 passes is about .008" stepover, 192 is about .005" stepover, and 256 is .004" stepover. Normally for carving you want about a 10% of bit diameter stepover. So "best" seems to be about right... although normal is almost there. If you change to an 1/8" bit for your default bit, then what does the program do then?


I'd still like an official answer from CarveWright though... I'd love official IPM, and stepover amounts in thousands of an inch though. Connie, if you could get someone to post the official numbers, I'd greatly appreciate it.

[RMarkey]

mode
x step
y step
z step


draft
0.01
0.01
0.0001


normal
0.008
0.01
0.0001


best
0.005
0.006
0.0001


optimal
0.004
0.006
0.0001

[Underdog]

Thanks Metallus... So the 'unofficial' measurements were right...
What's the Y and Z step?

So what's the IPM?

And if the default bit is changed to an 1/8" ballnose bit, does the stepover change?

[TerryWinslow]

The movie was "Code Red"



"You can't handle the Truth !!!".... Just kidding... What movie was that...

Honestly don't know.... Couldn't resist....

AL

[lynnfrwd]

The movie was "Code Red"

I thought it was "A Few Good Men", as 55president said.

[RMarkey]

What's the Y and Z step?
Well, this isn't a stepper-based cnc, its an encoder based cnc, x & y represent each raster point it carves. The z value is the accuracy on that axis.


So what's the IPM?
variable, based on bit, depth, and a line-by-line carve analysis


And if the default bit is changed to an 1/8" ballnose bit, does the stepover change?
not for that, but yes for larger bits.

[55president]

My inches per second varies widely. I usually carve on the "best" setting and looking at my data, it varies from 1.71 IPS to 2.59 IPS. I'm carving no deeper than .08 in so if deeper this would be slower.

FXP

[55president]

THe movie was "A Few Good Men" I remember because my wife and I went to see it on one of our first dates?

Here's a clip of " I want the Truth!", "You can't handle the Truth" scene.

http://www.youtube.com/watch?v=hopNAI8Pefg

Kevin Bacon, Demi Moore, Tom Cruise, Jack Nickelson

[TerryWinslow]

I stand corrected... :rolleyes:


I thought it was "A Few Good Men", as 55president said.