The cam grinders I have seen dive straight into the cam face as the
camshaft turns. Flat tappet cams are tapered from side to side so
the tappet rotates as the camshaft turns to distribute the wear on the
tappet. Roller camshafts are straight across.
The guy I am talking to wants to move the grinding wheel in and out as
the cam turns to regrind existing cams.
Think of a tool post mounted grinder on a lathe with a cam in the chuck.
The toolpost would move in and out as the cam turned similar to the
video that Andy linked to in his message.
Here is an old style cam shaft grinder where the bed rocks back and forth.
http://www.youtube.com/watch?v=9R8y-aHvI8g
Here is a big crankshaft grinding machine that is for sale .....
nothing to do with my camshaft question.... I just thought that it was
really well done and the music is nice for machine junkies like us .. :-)
http://www.youtube.com/watch?v=yS9hk9ti9WQ&feature=related
Dave
On 6/14/2011 6:18 PM, Przemek Klosowski wrote:
> My understanding was that grinding doesn't require wheel diameter
> correction because the precision grinding happens on one side of the
> wheel:
>
> |____| wheel moves this way -->
> -----xx----------------------------------workpiece
>
> On 6/14/11, Martin Dobbins<[email protected]> wrote:
>
>> Sherline sells a miniature version of what you are talking about, and since
>> they sell their CNC machines with EMC installed it's probably done with
>> that. There's a picture here:
>>
>> http://www.sherline.com/images/CamGrindCallouts.jpg
>>
>> and a couple of you tube videos here:
>>
>> http://www.youtube.com/watch?v=OIWyGtXEgR4
>>
>> and here:
>>
>> http://www.youtube.com/watch?v=PlZDg0rpIi8
>>
>> I understand Joe Martin (owner of Sherline) hand wrote the G code for this,
>> he might let you have it if you drop him a note.
>>
>> Hope that helps?
>>
>> Martin
>>
>>
>>
>>> Guys,
>>>
>>> I know a guy who is interested in using EMC2 to control a cam grinding
>>> operation - as in automotive type camshafts cam lobe grinding.
>>>
>>> Usually a large diameter grinding wheel is moved in and out to grind the
>>> cam profile. Compensation for the wheel diameter is required.
>>>
>>> Has anyone ever done this before with EMC2 or otherwise? Attached is
>>> a diagram which is exaggerated in that the grinding wheel is usually
>>> much larger.
>>>
>>> A cam grinding machine looks like a lathe but the grinding wheel which
>>> is usually .75 inches wide and usually quite large - perhaps 12 inches
>>> or more in diameter and it moves in and out as the camshaft revolves to
>>> grind the profile.
>>>
>>> Here is a diagram that shows the wheel to cam situation:
>>> http://imagebin.org/158266
>>>
>>> Dave
>>>
>>> ------------------------------------------------------------------------------
>>> EditLive Enterprise is the world's most technically advanced content
>>> authoring tool. Experience the power of Track Changes, Inline Image
>>> Editing and ensure content is compliant with Accessibility Checking.
>>> http://p.sf.net/sfu/ephox-dev2dev
>>> _______________________________________________
>>> Emc-users mailing list
>>> [email protected]
>>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>>
>>
>> ------------------------------------------------------------------------------
>> EditLive Enterprise is the world's most technically advanced content
>> authoring tool. Experience the power of Track Changes, Inline Image
>> Editing and ensure content is compliant with Accessibility Checking.
>> http://p.sf.net/sfu/ephox-dev2dev
>> _______________________________________________
>> Emc-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>>
> ------------------------------------------------------------------------------
> EditLive Enterprise is the world's most technically advanced content
> authoring tool. Experience the power of Track Changes, Inline Image
> Editing and ensure content is compliant with Accessibility Checking.
> http://p.sf.net/sfu/ephox-dev2dev
> _______________________________________________
> Emc-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
------------------------------------------------------------------------------
EditLive Enterprise is the world's most technically advanced content
authoring tool. Experience the power of Track Changes, Inline Image
Editing and ensure content is compliant with Accessibility Checking.
http://p.sf.net/sfu/ephox-dev2dev
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
