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311  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: May 23, 2012, 12:51:11 PM
Ah... so I guess it explains the video then.

Dan
312  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: May 23, 2012, 03:35:28 AM
Can't find this now, but here is a similar one:

http://www.youtube.com/watch?v=e9BvPeAmuvc

May be I was wrong about the 80W, but it's still way lower than we thought.

Dan
313  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: May 23, 2012, 03:28:28 AM
Tweakie,

I seem to remember I saw some manufacturer of small CNC CO2 laser machines which claimed they cut metal (SS if I recall) up to 1mm with something like 80W. They had a video as well. I'll see if I can find the link.

Dan
314  Third party software and hardware support forums. / PoKeys / Re: Pokeys tests on: May 10, 2012, 08:32:51 AM
Yeah... Sad was hoping to hear that you had a way of doing this inside Mach.

Dan
315  Third party software and hardware support forums. / PoKeys / Re: Pokeys tests on: May 10, 2012, 05:11:10 AM
Thanks Hood. Looks like I misinterpret the sentence about index homing in your first message. You said you were doing homing external to Mach, so I concluded that you implied that Pokeys would allow you to do it internally in some way.

Dan
316  Third party software and hardware support forums. / PoKeys / Re: Pokeys tests on: May 10, 2012, 04:19:25 AM
Hi Hood,

Got a question for you. How would you go about doing homing using a servo's index pulse? I imagine that after Mach finishes its regular homing routine and bounces off the switch I will have to use a macro that will rotate the motor in a set direction till it detects the index (not sure how to do that either). But will a macro be able to see a pulse as short as a servo's index? I am going to use an ESS which will see the pulse no problem, but I am concerned how a macro will see it?

Dan
317  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 25, 2012, 03:44:59 AM
To be honest Dan it will likely be fine seeing as its a relatively light duty machine and you wont be taking massive cuts, I was just curious as I think I would have chopped the cross slide down by half and had all the trucks on it, in fact I probably would have just made up a sub plate as a cross slide and that would have given me the option to mount different configs of top slide on such as gang tool setups.

I see what you mean. Gang tooling was also in mind, so thought I could utilise the T-slots.

I have been toying with the idea of making a wee lathe style machine as I have some beautiful heavy duty roller slides that came from a scrapped Bullard lathe and I need to use them for something Grin
Hood

Grin Having them lying around is good enough a reason.

Dan
318  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 24, 2012, 11:43:26 PM
Thanks Hood. The linear blocks are attached to the carriage for a few reasons. First flipping them around would have meant I had to drill 24 through holes in the cross slide right where the T-slots are, which preferred not to. Second, I did the design before I thought of putting a sheet metal guard on top to keep chips away and when the rails are on the top part they will always stay clean. With a guard it won't mean much, but it was a consideration at the beginning. And lastly I wanted to gain more X travel. The carriage is shorter then the cross slide and I couldn't mount the same length rails on the carriage.

I know that it may be problematic and I also had Graham tell me that I may have overhang problems this way. When the blocks are on the moving part the load on them is always the same regardless of their position. In my configuration the blocks are stationary, meaning the load on them will vary with the cross slide position. It's same as on a mill, where gaining X travel is desired and then you have a long table riding on a short bed. But the little difference is that on a mill the load is always at the bed centre Wink.

Anyway, I can always limit the stroke if I see chatter problems at the extents. And if it's really bad I will consider flipping them over.

Dan
319  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 24, 2012, 12:48:10 PM
After the headstock had been aligned parallel to the ways by filing its V-guide, it became a bit lower and the tailstock needed to be aligned accordingly. I took apart the top part of the tailstock and milled 0.3mm off from the tailstock base:


Got it aligned to within 0.03mm vertically. It's quite a satisfactory for me.


Dan
320  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 23, 2012, 10:46:28 AM
Assembled the cross slide and linear guides and the X axis ball screw. Here are a couple of pictures:





It's just a preliminary assembly test so not all screws are there and it's not tightened yet. All fits nicely and look like it's going to work Smiley

Also made a spacer ring to mount the pulley on the spindle. It was needed because the original pulley was wider being 3 stage and plus there was a gear on the spindle. Just turned down the the original pulley and cut off the required length. Here is the spindle pulley mounted:


Dan
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