Re: [CAD_CAM_EDM_DRO] Cutting speeds

Ian,

Hope your dental burrs are the carbide variety and not HSS, and are very
sharp. I've worked with just a bit of titanium. It's tough and gummy,
and will eat dull tools alive. Titanium transfers heat poorly, thus even
a slightly dull tool will cause a greater heat buildup than you might
suspect, which can quickly escalate until your tool is glowing red or
breaks.
Be aware that dental burrs are designed for very light chip loads.
Materials that don't transfer heat well generally require higher chip
loads (depth of cut per tooth) than materials that do tranfer heat well.
I'd try light cuts depth-wise, and try not to move too slowly.
I've used MolyDee as a lube on Ti, but not sure that's the best.
Good luck!

Jon

Ian Wright wrote:

>
> Hi,
>
> I know this will sound like a really purile question and I'm really aiming
> it at those who do small work on desktop machines but here goes...
>
> How do you decide on an appropriate feedrate for materials and cutters you
> haven't used before? For example, say you were presented with a piece of
> titanium sheet and asked to cut out several identical parts using, say, a
> dental burr - how would you decide on the best feedrate to use or, at least,
> choose one that wouldn't break the tool or dull its cutting edges? I know if
> I'm working on my manual lathes or miller that I can adjust the speeds and
> feeds to get optimum performance simply by using my ears and the feel of the
> handwheels but this isn't possible with a cnc machine as you have to program
> in a feedrate and then just hope its Ok.
>
> Wise words from the knowing would be greatly appreciated.
>
> Ian
> --
> Ian W. Wright
> Sheffield UK
> www.iw63.freeserve.co.uk
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager