Strategy help

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TaylorP

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We've swapped to TD's burs, and the cutting diameter is a few millimeters shorter than the stock burs, so they get pinched every once in a while between the stock and the part, and causes slippage, and ruins the entire job. Is there a workaround for this, or an adjustment to the strategy that could be made to compensate? Our reseller is telling us that we can't make this adjustment, and we either have to buy stock burs or write whole new strategies to make the adjustment, and if we use our own strategies, we will no longer be eligible for CAM support service.

For clarification, the stock Roland burs are roughly 19mm from the tip to the beginning of the taper, whereas the TD burs are roughly 17mm to the same point.

Thanks in advance for any help you could offer!

Edit: This is Sum3D, btw.
 
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zero_zero

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Open the "Tool Parameters" in your strategies, adjust the lengths/diameters to match your new burs. Make sure you do it for each step. Save the strats under a new name.
Also, you could add the new tools (measurements) to your tool archive and subsequently pick from there, so you don't have to enter the values every time.


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Isn't the length only for that of the cutting length, not the shaft length? It's set at 5.75 now.

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zero_zero

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It's for the cutting length, from the tip to where the taper starts.

tool.jpg
 
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If it's already set at 5.75mm, wouldn't it prevent this problem, though? It wouldn't cut through a puck thicker than 11.5mm.
 
CoolHandLuke

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Isn't the length only for that of the cutting length, not the shaft length? It's set at 5.75 now.

Sent from my SM-G930V using Tapatalk
if you have it at such a low value it will never be able to use the shaft to drill out an abutment hole for example, or cut 'halfway' through an 18mm puck. the software would think the shaft too short. it will then either calculate the unit and create collisions, or throw up an error that your strategy and puck do not match. but ive never seen this first hand to know what it would do.

so set it the full length of the shaft.
 
zero_zero

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If it's already set at 5.75mm, wouldn't it prevent this problem, though? It wouldn't cut through a puck thicker than 11.5mm.
Something that short usually applies for small diameter finishing burs (like 0.6mm for ex.) or special no-deflection tools. As rule of thumb, the length specified in the strategies should be the same as your actual tool reach, maybe a half a mm shorter for safety... so the conical part does not interfere with your work. As for how much your tool will plunge into the disk is specified in the respective strat step...in some instances will stop at z=0 (center off the disk) or it could go all the way to the other side...if you're drilling an implant access hole per se...
You mentioned that your new tools are 2 mm shorter then the originals, at 17 mm reach it should be no issues with milling unless you working with thick disks of at least 18mm and your strat is calling to go that deep.
 
deadhead

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most camming softwares make their strategies based on the cutting length of the tool that was used to create the strategy, not the actual length of the tool itself. With our Roland DWX50 we were getting our tools from a 3 party and they werent "original" roland tools from roland, but they worked fine even though the overall length was 1-2mm longer but the cutting length(which is the length from tip to where tool starts to get wider) was the same so milling wasnt issue since tool holder had room to compensate for a longer overall tool. But when we got our AG mills and got tools from same company that we got the roland tools, it was the same thing, tool was just a little longer, but when milling in the MIKRO from AG since the tools was longer it didnt work because were the tool change took place there wasnt enough room to pick up tool due to longer length so we would get errors. so we went back to our 3 party tool company told them our issue and they made adjustments to the overall length to match an original tool that we sent them and now, no issue with milling. So I would check into that before you start to rewrite strategies for a different length tool cause even though you make a new strategy for the tool, doesnt always mean it will work, because some of the smaller mills are built to only take a certain length tool due to space restrictions.
 
cadfan

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It all depends on one side to the cnc controller one is usable tool length ( most have 10 mm Z usability for tools ) the other length and geometry of the whole tool inkl Spindel for collision detection which is done in the cam too different things same same but different.
 
cadfan

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It all depends on one side to the cnc controller one is usable tool length ( most have 10 mm Z usability for tools ) the other length and geometry of the whole tool inkl Spindel for collision detection which is done in the cam too different things same same but different.


Schirmfoto_2017-05-04_011931.jpg Schirmfoto_2017-05-04_012030.jpg
 

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