Hole centres
18 Oct 2013 23:59 #40049
by bill516
Hole centres was created by bill516
Tried the search function but it does not want to play, or I'm too impatient.
Scenario is I've made a few items all the same but I've made a hole the wrong diameter, too small. Whats the best way to find the centre of the hole so I can re-cut to the correct diameter, at least for the first item all the others I could just set up a frame on the bed from the first to position them.
BTW I havn't done it its a pretend situation.
Bill
Scenario is I've made a few items all the same but I've made a hole the wrong diameter, too small. Whats the best way to find the centre of the hole so I can re-cut to the correct diameter, at least for the first item all the others I could just set up a frame on the bed from the first to position them.
BTW I havn't done it its a pretend situation.
Bill
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19 Oct 2013 06:06 #40056
by andypugh
it depends on what you have available.
I would use my Renishaw probe to find the centre. (using the handy sample probing routine supplied with LinuxCNC)
If you don't have one, the you can use a coaxial dial indicator.
If you don't have one, then you can use a normal dial indicator, and acrobatics.
or you can put the work on the bed loose and carefully lower a lathe centre (or centre drill) into the hole, then clamp it when the centre has located it in place.
A spindle-mounted camera is another alternative (and rather cheap now, about $10 and some machining)
Replied by andypugh on topic Hole centres
Scenario is I've made a few items all the same but I've made a hole the wrong diameter, too small. Whats the best way to find the centre of the hole so I can re-cut to the correct diameter,
it depends on what you have available.
I would use my Renishaw probe to find the centre. (using the handy sample probing routine supplied with LinuxCNC)
If you don't have one, the you can use a coaxial dial indicator.
If you don't have one, then you can use a normal dial indicator, and acrobatics.
or you can put the work on the bed loose and carefully lower a lathe centre (or centre drill) into the hole, then clamp it when the centre has located it in place.
A spindle-mounted camera is another alternative (and rather cheap now, about $10 and some machining)
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19 Oct 2013 17:36 #40060
by bill516
Replied by bill516 on topic Hole centres
Thanks Andy I should have been a bit more specific in that the hole dia is for instance more than 15mm or larger than the largest drill you have so you cant stick it on a drill press to open the hole up.
I'm still new to this CNC game so I'm on a learning curve. I assume that the probe method checks at various positions then extrapolates the centre from that, I was thinking of making a probe so it looks like I might have to. I've never heard of a co-axial dial indicator. The camera method is also new on me so I'll have a google.
I'm still new to this CNC game so I'm on a learning curve. I assume that the probe method checks at various positions then extrapolates the centre from that, I was thinking of making a probe so it looks like I might have to. I've never heard of a co-axial dial indicator. The camera method is also new on me so I'll have a google.
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19 Oct 2013 17:43 #40061
by ArcEye
There is a huge thread here on using a webcam, hopefully pasha's site is back up
www.linuxcnc.org/index.php/english/forum...other-tab-for-webcam
Replied by ArcEye on topic Hole centres
The camera method is also new on me so I'll have a google.
There is a huge thread here on using a webcam, hopefully pasha's site is back up
www.linuxcnc.org/index.php/english/forum...other-tab-for-webcam
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19 Oct 2013 18:11 #40062
by andypugh
Replied by andypugh on topic Hole centres
I assume that the probe method checks at various positions then extrapolates the centre from that,
I've never heard of a co-axial dial indicator.
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20 Oct 2013 00:18 #40070
by bill516
Replied by bill516 on topic Hole centres
Thanks Any and ArcEye I'll have a proper look at the link and vids tomorrow got to go to theater tonight
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