5 axis incremental bit

[Vinny]

Hi Everyone,

I recently bought an OMAG Digitale 5 with a sink cut out option. I never had a CNC Saw before, so all this is new to me. I'm having a really hard time figuring out what setting and what incremental bit to use. I'm getting blowout on pretty much every material. especially on ornamental, luna pearl, uba tuba and all quartzite. Does any one have any advice on which incremental bit to use, what type of setting to try?

Also the difference between soft and hard bond bits?

Any help is appreciated

thanks

[bradleyg]

Hey Vinny,
When I know I'm cutting something that's likely to blow out, I run a 10 or 12 mm non-coring bit instead of a step cut bit. Set the bit to cut 2mm per pass instead of 1mm, and decrease the travel speed to 450. it will take 40% longer to cut corners, but you will get really good corners.

[Vinny]

Hey Vinny,
When I know I'm cutting something that's likely to blow out, I run a 10 or 12 mm non-coring bit instead of a step cut bit. Set the bit to cut 2mm per pass instead of 1mm, and decrease the travel speed to 450. it will take 40% longer to cut corners, but you will get really good corners.
[

Can you tell me which bit you use?

I'm using a 20 x 20 soft bond incremental milling bit. my depth is .096 inches and feed rate is 25 inches per minute

[Vinny]

Hey Vinny,
When I know I'm cutting something that's likely to blow out, I run a 10 or 12 mm non-coring bit instead of a step cut bit. Set the bit to cut 2mm per pass instead of 1mm, and decrease the travel speed to 450. it will take 40% longer to cut corners, but you will get really good corners.
[

If you change to a 10 or 12 mm bit, then do you have to recalibrate the alignment with your blade?

[bradleyg]

On our saw, if you put in the size of the bit in the tools menu it sets the calibration to the blade. We do run the bit a little big..if it mics out to 12mm we enter it in at 12.8mm or so..you might have have to play with that a little

[bradleyg]

Our saw is metric, so the incremental bit is at 1mm cut at 1250mm/minute travel, and the 12mm bit is a 2mm cut at 450mm travel. Just divide these number by 25.4 to get the inches.. Your currently running your incremental bit at a 2.44mm cut depth, which it double what we run ours at..could be what is causing some of your blowout problems.
I think the brand we are currently running is a 1/2" Diamont non coring bit..

[Vinny]

Our saw is metric, so the incremental bit is at 1mm cut at 1250mm/minute travel, and the 12mm bit is a 2mm cut at 450mm travel. Just divide these number by 25.4 to get the inches.. Your currently running your incremental bit at a 2.44mm cut depth, which it double what we run ours at..could be what is causing some of your blowout problems.
I think the brand we are currently running is a 1/2" Diamont non coring bit..
[

This is the type of blowout I'm getting with granite

[Express Granite]

give me a call at 412-551-7565. i had the omag digitale too. we dont have any blow out. call me i can face time you to see my setting. we try few bits no issue.

[colin]

That looks like ALOT of bottom edge blow out for a stone like Luna. We only do sink cutouts on the saw when its a hard stone like taj or sometimes when its a drop in sink. i just did this drop in cutout on Bianco Romano. Not as grainy as Luna Pearl but...see photos. No blowouts really. Ive attached the table material we use, the tool we use, and the settings for that tool in AlphaCAM. We use the Apexx green bit for ALL STONE TYPES. I have a different setting for Taj type stones, basically half the removal and 2/3s the feed rate. Oh yeah, I also included the method of pinning the top in place. i used to screw blocks, now for the most part we just use screws.

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[Vinny]

give me a call at 412-551-7565. i had the omag digitale too. we dont have any blow out. call me i can face time you to see my setting. we try few bits no issue.
[

Hi Dennis,

I will have my saw guy call you tomorrow. this is all new to us since we used to cut by hand before. so my saw guy doesn't know much about rpm's or feed rate. If it's ok he might ask a lot of questions.

Thanks

[Vinny]

That looks like ALOT of bottom edge blow out for a stone like Luna. We only do sink cutouts on the saw when its a hard stone like taj or sometimes when its a drop in sink. i just did this drop in cutout on Bianco Romano. Not as grainy as Luna Pearl but...see photos. No blowouts really. Ive attached the table material we use, the tool we use, and the settings for that tool in AlphaCAM. We use the Apexx green bit for ALL STONE TYPES. I have a different setting for Taj type stones, basically half the removal and 2/3s the feed rate. Oh yeah, I also included the method of pinning the top in place. i used to screw blocks, now for the most part we just use screws. 20201026_125909.jpg20201026_125620.jpg20201026_125756.jpg20201026_125629.jpg20201026_130110.jpg20201026_125716.jpg20201026_130012.jpg20201026_125941.jpg
[

Wow, that looks ten times better than my cut out. How long did it take to drop that sink out?

[Vinny]

My latest blowout on viscount white,

Apexx blue bit 20 x 20
RPM 4500
Feedrate 15 ipm
Depth rate .04 ipm

Does anyone have any suggestions. i just can't figure out why i'm getting blowouts this bad? Are my setting bad? or is viscount white bad material. Any help would be appreciated?

[Alex DiPietro]

Another approach: rather than trying to get the whole over cut, just mill the radius, cut the straights with the blade, use a handsaw to free the piece, and just deal with the blowout in the corners.

[Vinny]

the blowouts are to massive, and the amount of glue I'm using is bad. the job looks horrible, with all the glue

[wkluender]

That's pretty bad. I would try turning your RPMs up to 5500-6000 and take half your cut depth likes Alex suggested above. I think we are running 5500 rpm, .02" depth, at 60 ipm on a terminator bit. We still get some chipping/blowout but not nearly as bad as what you posted. We also have a Thibaut TC-600 with a rubber top table. With that said, we cut some Viscon White this year that was exceptionally hard. The saw arbor was pulling 15-20% more load than typical and we ended up having to run a quartzite finger bit on the router or it would push the piece.

[Vinny]

That's pretty bad. I would try turning your RPMs up to 5500-6000 and take half your cut depth likes Alex suggested above. I think we are running 5500 rpm, .02" depth, at 60 ipm on a terminator bit. We still get some chipping/blowout but not nearly as bad as what you posted. We also have a Thibaut TC-600 with a rubber top table. With that said, we cut some Viscon White this year that was exceptionally hard. The saw arbor was pulling 15-20% more load than typical and we ended up having to run a quartzite finger bit on the router or it would push the piece.
[

Hi Wes,

so OMAG guys say I can't go higher than 5k RPM unless I take the blade off. I'll try the .02. I'm at 15 ipm, so I'll increase it to 60 ipm.

How long is does it take for you to cut out a sink?

Thanks

[colin]

....Vinny, then take the blade off. I have NEVER used my incremental tool with the blade on. On the Park Saber it takes less than 60 seconds to switch from blade to bit. i dont imagine its much different on an OMAG. How many sinks/slabs a day are you trying to get through that saw? Is your saw running all day? If not then who cares how long it takes? Another thought-You guys have been doing all hand fab til you got this saw right? Just dont run the incremental all the way through the slab. Leave an 1/8 or 1/4 and finish it by hand. you are polishing by hand anyway.

[wkluender]

That's pretty bad. I would try turning your RPMs up to 5500-6000 and take half your cut depth likes Alex suggested above. I think we are running 5500 rpm, .02" depth, at 60 ipm on a terminator bit. We still get some chipping/blowout but not nearly as bad as what you posted. We also have a Thibaut TC-600 with a rubber top table. With that said, we cut some Viscon White this year that was exceptionally hard. The saw arbor was pulling 15-20% more load than typical and we ended up having to run a quartzite finger bit on the router or it would push the piece.
[

Hi Wes,

so OMAG guys say I can't go higher than 5k RPM unless I take the blade off. I'll try the .02. I'm at 15 ipm, so I'll increase it to 60 ipm.

How long is does it take for you to cut out a sink?

Thanks
[

We cut most of the sinks on our router as it's significantly faster, but when we do cut sinks, the fingerbit is only used for radius cuts. Most kitchen sinks have a straight line that we cut with the blade. If we cut the full cutout with the incremental, that will easily take an hour or more for a 30" x 16" cutout. As far as leaving the blade on while running the fingerbit, that's a hard no. Most blades aren't designed to spin over about 2500 rpm for your average 16". It's a safety issue for me that I don't feel like testing. It's only about 2 minutes of downtime anyhow.

[Alex DiPietro]

....Vinny, then take the blade off. I have NEVER used my incremental tool with the blade on. On the Park Saber it takes less than 60 seconds to switch from blade to bit. i dont imagine its much different on an OMAG. How many sinks/slabs a day are you trying to get through that saw? Is your saw running all day? If not then who cares how long it takes? Another thought-You guys have been doing all hand fab til you got this saw right? Just dont run the incremental all the way through the slab. Leave an 1/8 or 1/4 and finish it by hand. you are polishing by hand anyway.
[

No need to take the blade off IMO. Point the blade towards the back of the table. We've been doing it for years.

[wkluender]

This was something posted recently on the Facebook page. That's a blade segment embedded in someone's arm. Why risk it?

[Vinny]

Hi Everyone,

I think it's working. Apexx white bit seems to be the key. First time with no blowouts since i bought the machine ( 2 months) crazy happy right now

White Paradise granite
RPM 4500
Feedrate 24 ipm
step cut .04 ipm

Just wanted to thank everyone with all the advice.

[Vinny]

Hi Everyone,

I think it's working. Apexx white bit seems to be the key. First time with no blowouts since i bought the machine ( 2 months) crazy happy right now

White Paradise granite
RPM 4500
Feedrate 24 ipm
step cut .04 ipm

Just wanted to thank everyone with all the advice.