As Viesturs says the scale comp can be used for an example see

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing

Dave Caroline

On 21/12/2013, Viesturs Lācis <viesturs.la...@gmail.com> wrote:
> 2013/12/21 Frank Tkalcevic <fr...@franksworkshop.com.au>
>
>> Can you do math in a .hal file?
>>
>>
>>
>> I need to set halui.jog-speed, which is just MAX_VELOCITY in the [TRAJ]
>> section of the ini file.  But MAX_VELOCITY is in machine units (mm/s),
>> and
>> halui.jog-speed appears to  be in program(?) units (mm/min), so I need to
>> multiple by 60.  I really need to do this in my hal file.
>>
>>
>>
>> setp halui.jog-speed [TRAJ]MAX_VELOCITY * 60
>>
>
> IMHO scale component is your closest friend on this question.
>
> Viesturs
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