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Type: Posts; User: trurle

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  1. Replies
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    Re: Drill-capable stainless steel?

    Tested finally SUS430 drilling with standard HSS, 2 flute, 118 degrees drills. Can make in average 15 holes 1cm deep each before drill break or become too dull. Seems machinability of SUS430 is good...
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    Re: Drill-capable stainless steel?

    Searching for "Stub drill" i have found 135-degree drills are made specifically for stainless steel drilling. May be using 118-degree bits was a mistake from very beginning..
    ...
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    Re: Drill-capable stainless steel?

    Yes, i noticed the low speed and larger down-force produce better result of stainless. The downside is what the 1.5mm HSS bit is too easy to break with excessive force. Will try with cobalt drills...
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    Drill-capable stainless steel?

    I have quite frequently to drill stainless steel parts. And can say what trying, for example, to make ventilated screw from SUS304 standard screw is very low-yield task. Slightest error in feed rate...
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    Re: Need Machine Recommendation

    I am using X-carve for similar task. Practical accuracy of positioning under light loads is plus-minus 0.2mm.
    Just take care - largest 1000mm table option have actual work area of 810x810mm. Also,...
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    Re: Rapidly dulling end mills?

    Finally it turned out to be a debris accumulation problem.
    The problem was resolved by vacuum-cleaning the surface of workpiece after each pass. Successfully cut planned 2 pieces of furniture (72...
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    Re: Rapidly dulling end mills?

    Tested. Problem is speed-related. To be exact, in last batch i have tried to cut a round corner 60 mm radius at 2mm deep and 3000 mm/min. After making about 60 degrees curve into X axis (of required...
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    Re: Rapidly dulling end mills?

    The problems with veering off always start at X-axis, which had only 1 belt-driving stepper as opposed to 2 steppers on Y axis and screw-driving stepper on Z axis. Therefore, likely the problem with...
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    Re: Rapidly dulling end mills?

    My most recent settings:
    0.125 inch dia 2 flute end mill, 0.04 Deep cut, 9000 RPM, 79 ipm.
    The mill starts to veer off course if cut depth is 0.08 inch or higher. The depth of 0.375 inch is...
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    Re: Rapidly dulling end mills?

    I have a glued wood laminate. The inner layers are sugi wood, and outer layers look like akamatsu or beech. The amount of glue seems to be low - quite easy to delaminate outer layers.
    The main...
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    Re: Rapidly dulling end mills?

    Well, i should try the 1-flute end mill in this case. The RPM are already on the lowest limit for my spindle, and bits smaller than 1/8 inch are not long enough to cut 18-mm panels i am working with....
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    Re: Rapidly dulling end mills?

    This is a common sense answer. Unfortunately, feed rate is already at stepper limit, and cooling seems to have no effect. Overheat indeed happens, but it seems to be consequence of problem rather...
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    Rapidly dulling end mills?

    I have a problem with unexpectedly fast dulling of end mill bits. Roughly, bit cuts fine for about ~10 meters of wood board, then chatter, overheat, smoke, missed steps of motor starts to happen....
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