Re: Force feedback handwheels

Although I agree with Paul, I can see the desire to have some sort of
feedback.

One might be to put a meter that shows torque of the spindle. it
would show one of the first stages of excess power needed from dull
tools or tools that are not set at the proper height.

The force feedback would, in my mind be valuable for light materials
so you don't go plowing into things that might not like high pressures.

and hard materials, where a dull tool will drastically increase forces
needed to cut.

But, since so much cutting is done with feeds on the lathe, I think it
might not be as valuable as one might think.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Paul Kelly" <tech@...> wrote:
>
> It's amazing how quickly your brain compensates for not having that
tactile
> feedback on an MPG. A friend has two MPG's on his lathe and, after
only a
> few cuts, you just don't notice the lack of feedback. I've had days
where
> I've switched back and forth between the CNC machine and the manual
one (A
> job that needed some semi-manual parting and facing in a bigger, manual,
> lathe) they soon felt the same. If anything the MPG driven machine feels
> better because it's less work to drive.
> PK
>
>
> _____
>
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Les Newell
> Sent: Monday, 24 July 2006 9:48 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Force feedback handwheels
>
>
>
> I have been busy designing electronic hand wheels for my latest lathe
> conversion and I have been wondering about force feedback. This machine
> will be used half as a manual and half as a cnc so in manual mode I
want
> it to feel like a manual. It is not difficult to monitor the servo
> current. This can then be used to feed back to the wheel. There are two
> options for generating the feedback:
>
> 1) use a servo motor on the wheel. This would be the most realistic but
> could potentially end up back driving the wheel if you don't have hold
> of it - a very bad idea.
>
> 2) Use a variable brake on the wheel. This is easy enough to do using a
> simple solenoid operated brake. It also has the advantage of being
> failsafe and there is no chance of back driving the wheel.
>
> Has anyone done this or used commercial machine with force feedback
> (assuming any manufacturer does it)? If so is it worth the effort?
>
> Les
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>