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Topic: Desktop CNC advice request (Read 3488 times) previous topic - next topic

DangerToMyself

As for the mill set Might I suggest.

A couple sets similar to these.

And a couple sets of these.

Between them you would have a good starter set suitable for a good range of work.

You can always add to those later with more specialist ones.

Bob.

Found similar end mills on eBay and have them on the way. However, my CC company locked my card down when I tried to order the machine and spindle from Banggood.  :smiley-mad: Hopefully I'll be able to get hold of them tomorrow and get it unlocked. Then get the rest ordered. Maybe I'll have it assembled before Christmas. I should probably start a PayPal account. Might make things simpler.

ballscrewbob

#31
Oct 27, 2019, 04:41 am Last Edit: Oct 27, 2019, 04:42 am by ballscrewbob
Not used bangood because of the same issue.
That's partly how I ended up on Aliexpress and never looked back.

Bob.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

AliExpress is way too pricey on their machines. Either huge shipping amounts or they say free shipping and jack their price up when you click on USA. A 3018 on there would cost close to $200. About $150 on banggood.

ballscrewbob

Yes you have to watch the shipping but so far no problems.
Maybe you are getting hit by Cheetos Tariffs ?
And maybe I need to have another look at bangood ?

Bob.
It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

Yes you have to watch the shipping but so far no problems.
Maybe you are getting hit by Cheetos Tariffs ?
And maybe I need to have another look at bangood ?

Bob.
Well, got the card straightened out and opened a PayPal account (I had no idea it was that easy to pay for stuff ). No issues whatsoever with my CC and PP. Payment is already pending on my bank account.

Got this spindle for $63.99

Machifit ER11 Chuck CNC 500W Spindle Motor with 52mm Clamps and Power Supply Speed Governor

And this machine for $132.99

3018 3 Axis Mini DIY CNC Router Standard Spindle Motor Wood Engraving Machine Milling Engraver

I couldn't get anywhere near those prices at AliExpress. And the items I ordered are coming in from Canada and should arrive in the next 3 or 4 days. The best AE could say on a delivery date was by 12/31.

So, for my case (this time) Banggood was the cheapest and quickest. Even besting eBay in both categories.

I ordered the Machifit collet set separately on eBay for $7 or $8 w/free shipping. 2 each of mill end sets similar to those you suggested for about $16 shipped. and 5 KW12-3PCB limit switches for $4 shipped.

With any luck, by this time next year, I'll have a fully operational battle ..... er .... CNC machine for approx $230. Cheaper than I had imagined. But I'm also aware there is more cost to come. LoL Like that laser!

(It's hard to say "fully operational" without going full Emperor Palpatine)

ballscrewbob

#35
Oct 27, 2019, 04:39 pm Last Edit: Oct 27, 2019, 04:57 pm by ballscrewbob
I remembered the other reason I didnt use Bangood was that they didnt have the larger machines.
Probably to keep shipping costs down.

Did notice some cheaper and some more expensive items so may have to pick and choose where I buy.
Already have PayPal from my Ebay days so not much to do or change.

I still run without limit switches but I should take the time to go that path and certainly will when I order the bigger machine.


Small list of SPARES or other goodies that are GOOD TO HAVE ON HAND.

8mm Bearings (flange) Same as on the machine (x2).

8x5 Coupling for the lead screws ( x2)

Assorted TEE nuts and TEE bolts to suit the different slots on the machine. Also useful for clamping purposes.

A spare controller (UNO and Shield) I got a few now but one set may save your bacon. And at about $8 CDN for a set it is not really wasted money and also provides a nice test bed. Also DRIVER BOARDS but pay the few cents extra for the higher duty ones. and always get them with heatsinks and be prepared to put a small fan nearby too aiming at them (longer term reliability)

Some small momentary push switches for use as the PAUSE RESUME and ABORT that you can mount in easy reach. (you may already have or can salvage) and SHIELDED cable to use with them. Old PS2 keyboards are great for that cable. Also some suitable DUPONT connectors if you don't already have some. I invested in the proper crimp tool a long time ago for regular Arduino work.

Suitable ON / OFF switch for the PSU's

Suitable ON/OFF switch for the spindle.

Digital Vernier, even a cheapish one will be fine. (at least 10 inch). Used to fine tune the alignments of the whole machine and keep track of tool sizes and a multitude of other odd machine related jobs.
Also a good 6" and 12" rule with imperial and metric scale.

Couple of spare stepper leads (invaluable in the long term)

At least one spare stepper motor. Also useful for testing but you may find at least one goes down on you if you stall them too often.

A decent terminal block to help with wire routing and keeping things simpler in the longer term as you add extra controls circuits etc. Also very useful for the STAR grounding you will need to employ when you are adding switches and such.

I also keep a spare 24v 15A PSU on hand.

IMPORTANT spares are the bearings. You only need the bearings which will probably be 12mm and 8 mm LM xx UU types. At least 4 of each size. You will probably need those at around 500 + hrs as you will have bumped the machine a lot by then if you are as foolish as me (I bet it can dig another couple of mm from this cut..Oh dang maybe not)

Some light grease EP2 or Lithium white. I use the white. to PRIME the bearings before installation.

A decent set of long reach ball end allen keys for those hard to reach places and better than the cheap bendy ones supplied with the machine.

A good selection of small washers and lock washers for use during installation. If you are a millwright you will notice a few places where none are included in the kit but as an engineer you will tell yourself that it needs one. You may also notice that that parts of the machine will benefit from the extra MM or so clearance especially the bed to the rod carriers. The kit will be mostly OK but a bit sparse in some areas. Also useful helping spread load for clamps and such.

A very understanding partner who is prepared to listen to you prattling on about parasitic noise on switches and why you crashed your machine and now need X amount of money to order Y part.

You don't need all those at once, and they are not in any particular order except that last one which is pretty critical but all worthy spares one way or another.

Loved the Star wars reference.
Prefer the HOLD MY BEER AND WATCH THIS approach myself.

Bob.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

ballscrewbob

#36
Oct 27, 2019, 05:06 pm Last Edit: Oct 27, 2019, 05:10 pm by ballscrewbob
And....

Be prepared to DEDICATE some tools to the machine such as the rulers and 6" and 12" tri square.
Maybe  some screwdrivers, small spanners (wrenches to the heathens).
Decent stanley knife (box cutter to the uninitiated).
Small plier set.
A multimeter (almost any cheap DVM will do)

A dedicated tool / shadow board comes in handy with room to expand.

Bob.

PS. did I mention the all forgiving partner ?


It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

Small list of SPARES or other goodies that are GOOD TO HAVE ON HAND.
That seems like a pretty comprehensive list. Thanks again! A few items I had thought about. Most I hadn't. All of which makes perfectly good sense though. A few items I'll get right away and then add the others over time to break up the expense.


A very understanding partner who is prepared to listen to you prattling on about parasitic noise on switches and why you crashed your machine and now need X amount of money to order Y part.
I have the luxury of only having to answer to myself.

But I will do some homework on "parasitic noise on switches". Wasn't aware that could be an issue though.

ballscrewbob

#38
Oct 28, 2019, 01:14 am Last Edit: Oct 28, 2019, 01:16 am by ballscrewbob
Side note to all this.

Finally fixed my parasitic glitches after a week of minor cable re-routes and upgrades.
Had gotten it down to just random PAUSE.

Step 1. Enclose cable runs individually in screening (old coax with centre removed is great for that). Heat shrinked the ends so it looks tidy.

Step 2. Route USB cable at diagonals to any cable crossing (old trick but works).

Step 3. Ferrites wherever possible at the ends of cable runs (all scavenged from misc electronics).

Step 4. Make and install a 0.47 electrolytic capacitor pack into a 4 way DUPONT header that goes to a set of ground pins, and feed other ends via some super soft thin stranded cable to the signal side of the switches. Also heat shrunk the cap pack.

Step 5. 10nF disc cap near spindle and another at the other end near the PSU.

Step 6. 10 nF cap across the spindle relay output.

4 hours dry run and not a single glitch.
Sounds like a lot of work but hope I can go back to a "lights out" approach at last.
Next test is actual cut and its will be in fully cured ELM so it will have its work cut out for it.

This thread gave me the impetus to get around to this job so thanks guys.

Bob.

PS as I hit post it told me you had just posted LOL.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

#39
Oct 28, 2019, 02:04 am Last Edit: Oct 28, 2019, 02:05 am by DangerToMyself
We all need a little push every now and then!

And your last post tells me I have a lot to learn about knocking down noise!

Need more coax? I think I still have a box of coax (probably 450' left in it ) out in the shed. I found it on the back porch of an abandoned house on a job site when I was a land surveyor several years ago. I may have to have you tell me how you removed the center. Just trim the outer layers back a little leaving the center core longer and then grab it and pull it out?

Side note to all this.

Finally fixed my parasitic glitches after a week of minor cable re-routes and upgrades.
Had gotten it down to just random PAUSE.

This thread gave me the impetus to get around to this job so thanks guys.

ballscrewbob

Yep that's pretty much how I did it but in about 2 foot lengths otherwise it will be a problem. (learned that the hard way)

And well on my way to adding limit switches too now...Dang you....LOL

Bob.
It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

#41
Oct 28, 2019, 02:26 am Last Edit: Oct 28, 2019, 03:00 am by DangerToMyself
And well on my way to adding limit switches too now...Dang you....LOL
You're welcome!  8) LoL 8)


And take pictures!!! I may need visual reference.

DangerToMyself

Well, so much for saving a few bucks. Banggood cancelled my order. Guess I'll be paying a little more over at eBay.

Banggood sent me an email saying they needed me to send them a copy of my driver's license to verify I am who I say I am. Seriously? As if I'm even going to give a single thought to actually doing that.

ballscrewbob

Hmm no way do they need that.


Bob.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

DangerToMyself

The machine should arrive in 2 days. Along with some of the "add ons". Hopefully I'll be able to at least start the assembly process this weekend.

I've been thinking on the whole shielded wires thing. Is there a down side to using shielded guitar cable? Not sure the gauge on each of the (I believe) 4 individual wires and won't til I'm home. I have several feet of fairly high quality not being used (yet).

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