Making Skins #74 - Brisbane Australia

[hevertg]

Hello Surfcnc, excellent your work friend, I have one year of post visatando MM and this friend liked me to, I have not STARTING to build, in 2013 I will sure get started, I only need to adjust the place where you will be my MM, now much like to know what engines and drivir choose? where I can buy them used I see are not the ones recommended for the MM,

excuse my translations

thanks greetings and I hope you can help me.

[Surfcnc]

Hi Hevert

Motors - MotionKing 34HS9801 with 4:1 reduction
Drivers - Leadshine DM856 Digital Stepper motor Driver

Motors are available direct from Motionking - http://www.motionking.com/
Drivers - http://www.driver-motor.com/Products.aspx

Regards
Ross

[hevertg]

Hello Surfcnc,
Step Motor 86HS9801 1.8 98 4.0 0.98 4.1 490 9.5 1.55 8 3.0
Step Motor 34HS9801 1.8 98 4.0 0.98 4.1 450 9.5 1.55 8 3.0

friend are the same Step Motor different brands?

I would like realiazar purchase in one place, give me some reference pedes 86HS9801? the 86HS9801 490oz-in and 34HS9801 450oz-in

[shaper]

I also used the 34HS9801, my understanding is that yes the 86HS9801 motor is the same motor, it should be fine.

[Surfcnc]

Thanks Jed

Ross

[sensei]

Hevert you have mistake 34H2A9840
34HS9801 98 4.0 0.98 4.1 490 9.5 1550 8 3.0 so its 490 oz the same like 86HS9801 . The difference is into the price:
34HS9801 -55$
86HS9801 -48$
DM856 - 65$
Also Deitech have around twice cheaper shipping ....... and Claudia is great...

[sensei]

That's from Deitech
Hello Sir,
Thank you for your inquiry about our cnc parts, we'd like to make the best offer as below:
1, 86HS9801 stepper motor: USD48.00/pc. x 4 pcs = USD192.00
2, DM856 stepper driver: USD65.00/pc. x 4 pcs = USD260.00 (DM556 stepper driver: USD58.00/pc. x 4 pcs = USD232.00)
3, Timing pulley 15XL: USD9.00/pc. x 4 pcs = USD36.00
4, Timing pulley 72XL: USD26.00/pc. x 4 pcs = USD104.00
5, Timing belt 300-XL-10 (length-XL-width): USD4.00/pc. 4 pcs = USD16.00
6, HF spindle DTS-23: USD238.00/pc x 1 pc = USD238.00 (HF spindle DTS-27: USD800.00/pc x 1 pc = USD800.00)
7, ER20 collect chuck: USD6.00/pc x 3 pcs (each size is ok) = USD18.00
The leadtime for the production is about 3 weeks.
As for the stepper diver, if you would work it with 86HS9801 stepper motor in high speed, it's recommended to use DM856 as the voltage is higher so the motor can run stable at high speed.
Also for the HF spindle, it's depends on how much power you need, because DTS-23 is 2.2KW and DTS-27 is 4.5KW, if 2.2KW is enough for you, DTS-23 is ok because it's the most pupular sale spindles.
To ship above quantity by DHL to you, the shipping is about USD191.00, with driver DM856 and spindle DTS-23 selected.
Also we have seashipment to Holland every month, if USD191.00 is too high, we can ship the goods by sea to our Holland office first, and then our Holland office send those goods to you by truck, guess that's much cheaper.
Please contact us if you have any other questions.
Regards,
Claudia

[sensei]

Motionking

Dear Sir,

The cost is as following:
Motor 34HS9801, $55.00/pcs, 4pcs ---------------- $220.00
Driver 2LA860, $75.00/pcs, 4pcs -------------------- $300.00
Express Freight Charges ------------------------------- $390.00
SUM $910.00
Note: The prices is in USD & valid within 10 days.
We just have express (FedEx) way to ship them. Pls confirm & feel free to contact me if any questions.


Thanks & Best Regards!

[Hardouin]

Hello Ross !

Thank you for sharing your files.

Could you tell us wich pulleys do you use on your reduction boxs. (diameters, pitch and tooth).

And how long are spacers ?



Bests regards


hardouin

[Axel1966]

Hi,

You will be able to calculate any reduction, with any pulley/belt type at : SPD-SI ;

[Surfcnc]

XL 18 and 72 tooth pulleys.
XL 170 Belts.
Spacer width is approximately 38.5mm.

I would ditch the bearing cup idea and just use an flange bearing.
This would require you sizing the bearing holes in the plate drawings to whatever flange bearing you could source.
The bearing cup idea works but it is tedious to machine and the flange bearing would probably work just a well.
Your spacer width will change if you use flange bearings.
Once you have all the parts it will be relatively simple to calculate your specific spacer width.

Regards
Ross

[Surfcnc]

While it might seem I have been a bit quiet on my projects lately, in fact I have been CNC'ing away very actively in the background.

A CNC associate has asked me to assist with the commissioning of a surfboard shaping machine.
While the Mechmate build went quite smoothly, this project involved bringing to life a CNC machine that was not designed with the same care as the MM.

The amount of problems with this project was a real eye opener.
Everything went wrong and I do mean everything but through this process it provided the opportunity to refine further what I learnt on the MM build.
The fellow surfer I worked alongside is a great hard working guy and totally committed to understanding his new machine.
The redesign process we had to undertake ranged right from the control box electronics, to upgrading the power supply and cabling, mechanical and motor upgrades on the machine itself.

Even once we had the machine working then it was time to put in a vacuum system to hold the boards.
A laser aligner was next and then adjusting the supports to get the software board models to match the output from the machine itself.
Given the combination of issues and then some new software on top of that, the learning curve was long and steep.

A short thanks to the MM forum people acknowledging the value and power of the shared knowledge in the forum.
A project with that many issues would have either cost a fortune to fix or lay idle as a failed project.
From my perspective it is such a pleasure to share my knowledge with other surfers who genuinely appreciate the precision that CNC machines bring to their designs.

regards
Ross

[isladelobos]

Hey Ross !!!

Thanks for the drawings, this is my way.

Nice sound with the reductions, you have one accuracy comparative after and before?

Regards.

[Surfcnc]

Hi Ros

I have not fully tested the accuracy.
I need to have a good look at that as some of my circle fits are a bit tight at present.

regards
Ross

[Surfcnc]

Hi All

A forum member visited me today for his dose of CNC 101.
He is a competent and talented fellow who makes incredibly accurate miniature building models with his laser cutter.
Horses for courses, so he was looking into the more industrial capability of a full size CNC machine for some of his other ideas.

As a demo project I made a new updated design of a surfboard thickness tool.
A small sheet of 12mm ply made 4 sets for around $2.50 a set.
For those of you without a Mechmate that will be around $25 a set thanks .

Measuring Calipers Small.jpg

Regards
Ross

[Surfcnc]

Hi All

I got around to editing some video of my machine making the prototype of the measuring calipers posted above.
Very happy with how well my machine is running, so for those of you still building, here is something to look forward to

http://www.youtube.com/watch?v=i85uyzjPv5A

Enjoy
Ross

[darren salyer]

Very nice, Ross.

[Surfcnc]

For those of you considering using a switching power supply rather than the recommended torriod and lots of capacitors check out this photo of the insides of a Perreaux power amplifier.

Perreaux Amplifier.JPG

Perreaux make magnificent audio equipment, note the similarity to our power supplies that also require smooth rapid busts of power.

Regards
Ross

[silverdog]

looks like it has 3 rectifier bridges ... so 1 transformer and 3 separate supply ? but maybe I'm wrong.
P.S.
Well, I remember years ago I built a power amplifier that had 1 toroid transformer and then two separete power supply circuits, one for each channel, it was a "impulse" amplifier type (not continuous) following the Carver concept that can supply hundreds of watts for short periond even if the continuos power was much less.

[Surfcnc]

Sharp eye there !
The amplifier is a 6 channel bridgeable unit.
So I am assuming three different left and right circuits powered by their own rectifier/capacitors.
This reduces/ elimates cross talk I believe.
The price for these is around 10,000 AUD

Regards
Ross

[KenC]

for 10k AUD, it better sound good!
I prefer building tube amps... at least they weight more

[Surfcnc]

I have made a prototype dust foot for an air cooled Chinese spindle.
It has been cut out of MDF and depending on how it fits, the final item will be made of polycarbonate.
The brush will be glued into the rebate and some rare earth magnets will hold the top and bottom pieces of the foot together.
The design is similar to my own dust foot but made as small as possible to allow for the 3D work the air cooled spindle does.

Image00001.jpg

Image00002.jpg

Image00003.jpg

Regards
Ross

[Dale Murray]

Hello Ross,
I live in Toowoomba. I was wondering where are you going to get the Brush material from. I've been looking but have not yet found a supplier. Could you assist.

Thanks Dale

[Surfcnc]

Sure Dale - but that depends on how you feel about being robbed.
If your fine with that go to Industrial Brushware at Wacol.

If you find someone who wants to sell small quantities or has some softer bristles, please let ME know.

Regards
Ross

[bradm]

That is pretty. I do wonder, though, how long your bristles will be, and whether they'll be able to reach the bit?

[Surfcnc]

Should be very close especially around the back!
The bit is 110mm x14mm and the brush is 75mm long.
Any thing that hits the bit it can have.

Ross

[smreish]

If you have patience and some time, get a "bottom of the door" threshold skirt and bend it up.
...Or, I have used a soft push broom and weatherstipping to make one up.

[KenC]

My experience thought me that there are no one answer to this. one has to do some trial & error to find the solution.
I had very bad experience with "bottom of the door " brush. From where I'm from, they only come in about 1" (25mm) height & because of this my shoe crash into clamps & other protruding objects around it & causes lost steps & ruin the work-piece. Get something taller, but too tall will get in the way of the spindle... I now use heavy duty transparent door curtain strips for the purpose. mine is ~60mm , If it is 75mm, my bit will chew up the skirt.

[Surfcnc]

Ken you are soooo right there.

I machined some 12mm polycarbonate for the dust shoe a few days ago.
Halfway through the pieces I thought to try using my DIY droplet cooler unit that shots air and coolant drops on the polycarbonate.

Well THAT works.
Attached is a pic of the off the machine cut (Rinsed with water of course).
No more 12,00 RPM limit as the heat build up and melting is no longer an issue.
This cut used a 2 flute 3mm carbide bit at 20,000 RPM.

A spray bottle would probably work just as well and just require a little more operator input.

Image00001.jpg

Regards
Ross

[Fox]

Hi Ross,

looks nice, reading about your success with coolant I remembered reading somewhere on a Dutch site tips for a perfect finish straight of the table.

Disclaimer; I can not try / have not tried them yet myself as my machine is not finished.

PMMA /POLYCARBONATE:

First pass:
single flute CCW
100 mm/sec @ 24000 tpm
leave 0,5 mm depth wise ( eg. material 6 mm then this pass 5,5 mm deep )
offset this first pass 0,2 mm from actual line.
with dust suction and without coolant

Final pass:
10 mm/sec @ 24000 tpm ( so feed at 10% of first pass)
0,5 mm deeper then material ( eg. material 6 mm then this pass 6,5 mm deep ).
without dust suction and with coollant ( they recommend distilled water for easy & clean results )





post 900...WOOOT, where can i collect my prize ?!