My JGRO build

[Sieg]

First of all, I am new here, so HI to everyone

I found this site a week ago and I've just started building my JGRO router.
As I am Dutch and use the metric system I do have to adjust the plans a little and recalculate a lot of stuff.
So far things are coming along fine, I do have a couple of questions though:

- I've been reading about 'backlash' in leadscrews, what does this mean? I don't know the word. Hence I can't figure out what the anti-backlash nut thing in the plans is supposed to do. Can someone please explain the concept?

- The stocklist shows what type of nuts and bolts I need, but since everything is different here in the Netherlands, I need some help translating the specs.
EXAMPLE: HEX HEAD BOLT 1/4-20 x 3.
I figure this means a bolt with a 6 sided head. 1/4 means the diameter of the bolt is 0.25 inch, and the x3 means its 3 inches long. Is this correct? And what does the -20 mean?


Thanks in advance,
Ill try to take some pictures of the build asap

[Jason Marsha]

20 threads per inch.

Jason

[silentreaper]

Backlash definition "The distance through which one part of connected machinery, as a wheel, piston, or screw, can be moved without moving the connected parts, resulting from looseness in fitting or from wear."

[Sieg]

Thank you

Here's some pics of what I built so far:







The parts are loose fitted, next step is to bolt the base and cutting bed to the supports

[Glidergider]

Nice job. My advice regarding the multiple taps called out in the plans, just use long wood screws. Don't bother tapping. The wood screws do need a small pilot hole though. A must.

Looks like you are making a lot of progress. Good job.

[Sieg]

Thanks. So far Ive used bolts and machinescrews like the plans say. Its a little bit more effort, but I think it makes it easy to take apart for painting i.e.

Things are starting to take shape
I took some more pictures and made a video of the gantry sliding on the rails, but my memorycard just kicked the bucket Hope I still have warranty on it so I can post more pictures asap!

[Sieg]

Ok I went out and replaced my phone's memory card, so I can take pictures again. Btw yea I shoot them with my mobile so please excuse the poor quality...







Up next is making the X-axis

[silentreaper]

Hey there Sieg but I notice you don't have the bearing/motor holes drilled in your table or in the gantry yet. I am just wondering if this is on purpose or just a slight oversight.

[Sieg]

It's on purpose I haven't decided what type of motors and rods I'm going to use yet, so I'm not sure how big I want those holes to be. Once I have purchased/built the whole drive system I can easily take the machine apart and drill the holes

[Sieg]

Ok I have a problem. I was planning on buying a cnc-package from hobbycnc, but after emailing I found out they don't accept creditcards?? They only accept USD, and since I live in Europe, I have no idea how to pay.

I also checked out Xylotex, but they don't ship to Europe at all.

I am looking to buy a complete cnc-package with drives, motors... the lot.

Does anyone know a shop that ships to Europe?

[Sieg]

Lil update

Ive been working on the x-axis as you can see.







Because there was a little bit of play in the x-axis bearings, I added something of my own design:





I mounted a top and a bottom plate to the gantry-rearbrace. Like the adjustmentblocks, they hold 3 bolts each, pushing against the metal pipes to keep them from flexing. A simple but very effective solution







And this is where I am now:







See you next time
Oh, and if someone could help me out with the question I asked 1 post back, I would be very grateful

[.xXACEXx.]

your machine is looking great good idea with the y axis supports! and also i for one LOVE to see all those pictures!! very motivating to someone who hasnt started a build yet,keep up the good work
sorry i dont know more about ordering from these sites as i have never ordered from any of them i was just looking trying to decide on what to power my cnc (which i havent even started on yet! )
it looks like xylotex has a place for credit card orders,and paypal
also stepperworld has a paypal order thing
keling also uses paypal ,...i hope some one else who lives "over the pond" might have better info for you,again ...great looking machine!!