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View Full Version : New Machine Build CRP 2448 PRO (not a 4824)



kjk2002
01-03-2014, 06:11 PM
6 boxes with about a million parts arrived just before Christmas and have slowly been assembled into my custom 2448 machine. It is custom only in that the gantry Y is the short axis, not the X. I specified this for extra rigidity, but now that I have the machine assembled, I might have been OK with the standard PRO design which accommodates a much easier expansion to larger 48x?? formats.

The machine is assembled, cable chain installed and wiring routed to the end of the X axis tray. Proximity sensors are installed and I've just returned from setting up MACH3 and testing the sensors/tool setter. Apart from the pin setup not matching the instructions (Ahren said it might not) everything worked exactly to plan. Electronics consists of the Plug&Play Nema23 box, which I can tell you is first class in fit and finish.

What went wrong (and suggestions)

1. The Y axis rack was too short by a few inches. Ahren had shipped me a new rack immediately on receiving my email, but the old one will work for testing until it gets here. This is what can happen with custom machines I suppose.

2. I insisted on placing the electronics where the cables in the package didn't quite reach. The order was correctly configured for the normal placement and I could relocate the electronics, but I opted to order extension cables instead and stick with my plan.

A suggestion: The Plug&Play electronics package could either be auto ranging or switch selectable for 120/240V. Currently the changes need to be done when the unit is assembled for which ever power is appropriate. This would mean the fan would need to run on one of the power supply outputs rather than the input voltage.

and another: Accomodate a 5'th axis driver for those who want a 4'th axis on the machine. Ahren tells me he's already doing this - I was just too impatient to wait. The case for the current Nema23 package is not large enough to accommodate an extra driver and a new one is being sourced.


All in all I'm a happy camper and thank Ahren and everyone at CNCRouterparts for a great job.


Now if my Kress spindle and extension cables would get here............

kjk2002
01-14-2014, 07:26 PM
A bit of an update:

The cables arrived and the machine moves under its own power now. I seem to have received a bonus of a bigger than standard Z axis - something I found when testing the range of motion when the cable chain ripped the spot welded nuts off the cable chain mounting bracket. A few chain links are on their way from CNCRouterparts to lengthen the chain.

On the spindle front the news is less good. 1050 FME arrived from DamenCNC - not an FME-1 as ordered. I'm now working with them to arrange a replacement. The problem is shipping cost - shipping the spindle back at normal UPS rates is $171.00. Damen CNC is now working with UPS to arrange a special rate. Here's hoping.

Meanwhile I've mounted an old makita laminate trimmer ($8 at a garage sale) and I'll make a few cuts with that.

I'd be interested to know what Z velocity settings others are using on their systems which have the pro Z.

pippin88
01-15-2014, 12:29 AM
If Damen CNC sent the wrong spindle you shouldn't have to pay anything for shipping!

kjk2002
01-15-2014, 09:49 AM
Damen have agreed to replace the spindle at their cost including shipping - Apparently though, UPS will reduce their rate to Damen for returns and that negotiation is what I am waiting on.

Damen have been very cooperative so far.

kjk2002
01-15-2014, 10:59 PM
Screeching Z axis - was traced with Ahren's help to binding against the Z dust cover plate. Removed the plate - no more binding. Now I need a solution for a new dust cover. The one that was on there was pretty thin stock already, so I'm not sure what the solution will be.

FoxCNC1
01-17-2014, 11:04 AM
Very nice build !!
the setting for my Z axis are : Steps: 10165, Velocity : 100, Accel : 200
this was as per an e-mail from Cory when I was setting up my machine. I too removed the back plate and at one point I even changed the velocity to 50 as the ball screw was binding. I ran the machine last night very successfully, I will very the setting for you tonight.

kjk2002
01-17-2014, 11:40 AM
I think you mean 20 for the acceleration. I am currently running a velocity of 100- accel 20 and while I think I could change the velocity to 200 now I don't really see any reason to do that. I am using 10160 for the Z steps but I got that number from Ahren - I haven't run a test yet.

kjk2002
01-17-2014, 07:57 PM
Things are moving slowly to completion. I mounted the spoil board assembly consisting of 18mm baltic birch with .75 in mdf on top. I ran a surfacing program on it using my $8 makita with a .75 2 flute cutter (.25 shank). The results were ok - not a great surface, but the machine isn't mounted solidly yet. I took some time and designed a mount for the Kress spindle which bolts on to the CRP mount backing plate. If anyone is interested, I'll post the CAD files here. I also did a design for a dust shoe to go with it. I've made the mount and tried the spindle in it - seems fine. I haven't yet made the dust shoe.

I tried to vacuum up the dust as it was being generated but managed to trip a proximity sensor (twice) as the vacuum hose ran up on the sensor (it is metal reinforced). I think some guards would be a good idea to protect the sensors from contact with objects. This would protect against accidental limit hits but also protect the sensors themselves. I think I've seen some done in plexi - maybe I saw them here.

Meanwhile the Kress saga continues: Damen will email me a UPS return label and I'll ship back the wrong unit Monday. They will return ship me the correct one.

FoxCNC1
01-17-2014, 10:36 PM
Sorry you are right, I meant 20 for acceleration. I am running 210 velocity as for some reason if I run 100 the Z tends to bind.
I am also working on a dust shoe because the dust is incredibly crazy.

kjk2002
01-18-2014, 09:12 AM
If the Z binds at any velocity, I'd look for another source of friction, like perhaps the eccentric nuts being to tight.

FoxCNC1
01-19-2014, 04:15 PM
yes I also looked at that. They were very tight from the factory. I did mention this to the CNCRP team and I was told they Z axis were built like that intentionally. I didn't really buy that response but I took the whole thing apart. My axis now runs very smooth after I corrected that. I also tested at 100 and 120 and it runs fine.

kaetamer
01-19-2014, 06:45 PM
Where exactly are the "eccentric nuts"? Thanks.

FoxCNC1
01-19-2014, 07:04 PM
Where exactly are the "eccentric nuts"? Thanks.

on the left side of the Z axis behind the bearings (top and bottom)

PS: Do you guys like the "bristles of my dust shoe" ? lol

http://i10.photobucket.com/albums/a146/Profoxcg/20140119_185613_zpshr4g1szu.jpg (http://s10.photobucket.com/user/Profoxcg/media/20140119_185613_zpshr4g1szu.jpg.html)

kjk2002
01-19-2014, 09:11 PM
The eccentric nuts are located behind the V bearings on one side only of the Pro Z axis. They are used to tighten the bearings against the steel rail that they ride on.
They should be just tight enough so that you cannot rotate the stationary bearing against the steel.

FoxCNC1
01-19-2014, 09:25 PM
The eccentric nuts are located behind the V bearings on one side only of the Pro Z axis. They are used to tighten the bearings against the steel rail that they ride on.
They should be just tight enough so that you cannot rotate the stationary bearing against the steel.

Correct, that is what the picture show. It should be tight, but the way mine came from CNCRP was way too tight.
Also, are you getting their proximity sensors and z touch plate ?

im going to order the sensors, but have the z touch plate w the spring and i like it very much. I recommend it.

kjk2002
01-19-2014, 09:49 PM
I bought a cheap set of proximity sensors off ebay and they work just fine - The essential difference between these and crps is range. More range gives you better protection of the sensors by the bumpers. They may well be more repeatable, but I haven't had any issues with mine in that respect. I also have the tool height setter and I agree it is great.

MDF dust is killing me - dust shoe is rapidly moving to top of the build list but I need my spindle to get here. Will be at least a week before my reject gets to the Netherlands and my proper spindle makes the return trip.

At least the mdf cutting into the table is done now and I can cut some real wood.

Where can I get some brush strips to put on my dust shoe?

FoxCNC1
01-19-2014, 10:05 PM
i am also trying to find some.

kjk2002
01-19-2014, 10:17 PM
This is the only one I have found. I've seem manufacturers sites that do it, but no retailers.

KentCNC, LLC. Replacement Brush (http://www.kentcnc.net/nc/products/101-replacement-brush.aspx)

ludite53
01-19-2014, 10:38 PM
I used this stuff from McMaster, It works really well on my dust shoe.

McMaster-Carr (http://www.mcmaster.com/#catalog/120/1278/=qbropf)

219414

kjk2002
01-19-2014, 10:45 PM
Unfortunately McMaster-Carr don't ship to Canada. I'll improvise something until I can find some proper brush.

FoxCNC1
01-20-2014, 07:06 PM
This is the only one I have found. I've seem manufacturers sites that do it, but no retailers.

KentCNC, LLC. Replacement Brush (http://www.kentcnc.net/nc/products/101-replacement-brush.aspx)

KentCNC makes a nice shoe. I was going to buy one of his but he only makes a 4" vacum version and I saw this as an opportunity to get used to the machine and same some stuff.

The shoe geometry I designed fits nicely and works well. I will look at the McMaster brush. Seems reasonably prices and it should do the job.

FoxCNC1
01-20-2014, 07:07 PM
I used this stuff from McMaster, It works really well on my dust shoe.

McMaster-Carr (http://www.mcmaster.com/#catalog/120/1278/=qbropf)

219414

Thank you for posting that info. I like your machine!

FoxCNC1
01-20-2014, 07:09 PM
Unfortunately McMaster-Carr don't ship to Canada. I'll improvise something until I can find some proper brush.

if you paypal me the money I can buy you some. But it may take some time since it has to come to me and I have to mail it to you etc. But I can help you.

kjk2002
01-20-2014, 07:14 PM
The shopbot I used at the local makerspace had a shoe that used heavy vinyl fingers rather than a brush. I think I'll make one like that and another with brush later on. I appreciate your offer, but I'll see what I can get in the UK when I'm there next month. I found a source there for various types of brush.

I may take you up on your offer when I get back from England in May.

I ran my first "real" job this afternoon - a simple sign (in Cedar) with raised lettering - It was nice having the aroma of cedar in the shop instead of mdf.

kjk2002
01-23-2014, 09:42 AM
User ThomD sent me a PM, and I attempted to reply, but he is not set up to receive private messages.

kjk2002
02-02-2014, 04:01 PM
It's been a while since I said anything about this build. It's nearly complete now - I have the Kress 1050 fme-1 spindle finally and have made a mount for it to adapt to CRP's Z adapter plate. This afternoon while waiting for some glue to set on another project, I cut off the EU plug from the Kress power cord and wired a North American plug. I plugged it in and was amazed at how quiet it is. It is true that at the highest speeds it's noise level rises substantially, but at the speeds I expect to use it will be a welcome relief from the Makita laminate trimmer I have been using while I waited.

Ahren has sent me a few bits I need to implement and when I've done that I'll post a picture or two.

FoxCNC1
03-17-2014, 10:37 PM
Hows it going?

kjk2002
03-18-2014, 03:57 AM
I'm on my boat in the UK til mid May, so nothing is happening on the machine - I'm suffering cnc withdrawal. I do have my laptop and I can draw things to work on when I get home.