cutting inside cut

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cutting inside cut

Postby Just Starting » Tue Jan 08, 2019 8:50 pm

ha folks
HAPPY NEW YEAR
ok this is whats happening
ive been cutting signs so really didn't notice.
also haven't cut from Thanks Giving till New Year
cnc shark 24x24 table-dewalt router- .25 em bit (sharp)
post processor (cnc shark-USB 3D contour inch)

i cut a circle 2.75 inside cut (building a carriage for a smaller router)
finished cut 2.68-cut a square 3x3 finished 2.95x2.98 also inside cut.

what am i missing here?
thanks
otto
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Re: cutting inside cut

Postby Rcnewcomb » Tue Jan 08, 2019 10:25 pm

Can you post the file? Oftentimes in these situations the tool diameter in the tool database is different than the tool name, or a different tool was used in the router than was specified in the cut file.
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 4:04 am

Sure
I'll get it to ya tomorrow
Thanks
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Re: cutting inside cut

Postby FixitMike » Wed Jan 09, 2019 7:40 am

It can be tool and machine deflection. What happens if you run the cut a second time so there is only a slight amount of material removed?
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Re: cutting inside cut

Postby ger21 » Wed Jan 09, 2019 12:36 pm

If you were climb cutting, try conventional.
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 3:04 pm

yep
I did run a second cut.
it ran along the same track
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 3:12 pm

router clamp cnc.crv
(223.5 KiB) Downloaded 35 times

Rcnewcomb
here's the file
otto
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Re: cutting inside cut

Postby Adrian » Wed Jan 09, 2019 3:26 pm

Tool sizes look ok. Is the machine properly configured? If you tell it to move one inch does it move exactly one inch etc?

Most likely going to be deflection due to flex in the machine itself or slop somewhere if it's configured correctly. Sharks aren't the most robust of machines so it might be worth slowing the feed rate down.
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 3:32 pm

Rcnewcomb wrote:Can you post the file? Oftentimes in these situations the tool diameter in the tool database is different than the tool name, or a different tool was used in the router than was specified in the cut file.
Attachments
router clamp cnc.crv
(223.5 KiB) Downloaded 25 times
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 3:34 pm

ger21 wrote:If you were climb cutting, try conventional.

i'll give it a shot
thanks
otto
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 3:38 pm

Adrian wrote:Tool sizes look ok. Is the machine properly configured? If you tell it to move one inch does it move exactly one inch etc?

Most likely going to be deflection due to flex in the machine itself or slop somewhere if it's configured correctly. Sharks aren't the most robust of machines so it might be worth slowing the feed rate down.


that is a great answer. your right about the shark too.
i'll recheck the configureation
thanks
otto
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Re: cutting inside cut

Postby Just Starting » Wed Jan 09, 2019 10:02 pm

Adrian wrote:Tool sizes look ok. Is the machine properly configured? If you tell it to move one inch does it move exactly one inch etc?

Most likely going to be deflection due to flex in the machine itself or slop somewhere if it's configured correctly. Sharks aren't the most robust of machines so it might be worth slowing the feed rate down.


adrian
you where absolutely right about robust. i slowed the feed down to 50 then when cutting i slowed it down to 25% and it did great. i was cutting a .75 sheet of clear plexi for a smaller router holder on this machine. you got to pay to play

thanks to everyone for the good advise
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