Viesturs, It depends what kind of machining you'll be doing - the forces in milling are lower than those in drilling. Based on some axis motor testing I did a couple years back, I would guess at a conservative estimate of around 250 lbs per spindle horse power for the worst-case machining parameters. For example, if you have a 2hp spindle and you're using all 2hp, you'll need to deliver 500 lbs of thrust along the axis of cut.
Forces required in Z for drilling - Machinery's Handbook (p1061 in Edition 28) estimates 7/8" hole in low carbon steel, 8 thou/rev needs 2313 lb thrust. Also consider that on profiling passes with a high helix end mill you'll see the end mill pull itself into the part - these forces can be higher than milling XY forces as well. How these numbers translate into sizing your rotary spindle stage depends on the geometry of that stage. Kistler makes nice instrumentation for measuring machining forces (http://www.kistler.com/mx_es-mx/4111_Application/Applications-Force-During-Stock-Removal-Process.html). I imagine you could find some academic literature using their instrumentation to give you more exact data. Rogge -----Original Message----- From: Viesturs Lācis [mailto:[email protected]] Sent: Monday, July 02, 2012 5:16 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Plasma 2012/6/29 Les Newell <[email protected]>: > > If you are mainly planning on cutting aluminum I would suggest looking > into oil mist cooling instead of flood coolant. Can anyone suggest me way to obtain cutting forces? I would like to have spindle motor on a rotary joint. Since the space is limited, I have an idea for compact design. I have all the sizes, offsets from rotary axis to tool tip etc. But I need to know cutting forces to find out required motor torque for the rotary joint and also for some construction elements. Those forces will depend on depth material, removed in single pass, diameter of tool, the sharpness of tool (worn-out tool will require higher force). Probably there are other factors as well. Can anyone share some source of information or at least share their experience? Thanks! -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
