MechMate CNC Router Forum

Go Back   MechMate CNC Router Forum > Personal Build Histories > Introduce yourself and start planning
Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Reply
 
Thread Tools
  #1  
Old Wed 28 December 2011, 03:39
pmesilver
Just call me: pauly
 
warwick
United Kingdom
New build in UK - Warwickshire UK

hi
I am located in Warwickshire UK, I love the design of this amazing machine and just have to have one.I have been reading many of the posts in the forum to get an idea of what is involved.

I have downloaded the drawings and am designing my table to take a 8' x 4' standard sheet, and hope to start building in january.

I have a fully functioning metal and wood workshop, can weld , machine and have cnc milling and cad/cam expertise, therefore am hoping i can build fairly easily.

Just wondwering if there are any other mechmates in my area, maybe to look at.

regards paul
Reply With Quote
  #2  
Old Wed 28 December 2011, 06:45
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
Paul,

Welcome to the team !!!
Reply With Quote
  #3  
Old Mon 02 January 2012, 14:07
nightwinter
Just call me: BIG D
 
Tyne & Wear
United Kingdom
Hi "pauly"
How you getting on with your build? Im from Newcastle and im thinking of building this myself. If you get stuck for laser cutting and you want a cheap option im able to cut the parts via Plasma.

Hopfully we could help eachother out finding parts.

All the best
Derek
Reply With Quote
  #4  
Old Mon 02 January 2012, 15:59
Andrew_standen
Just call me: Andrew #109
 
Dorset
United Kingdom
Thumbs up

Hi "Pauly",
I will also be starting a build but not till the summer, so a good six months to go.
I will be watching your build with interest.
Please make a list of the parts and where you got them from.

I hope to build for 8 by 4 sheets and I'm not sure if to go with belt reduction or 7.2 built in gear boxes.

Good luck.

Andrew

Southampton UK
Reply With Quote
  #5  
Old Sun 22 January 2012, 14:58
pmesilver
Just call me: pauly
 
warwick
United Kingdom
possible motor

I have read many of the posts about motor selection and belt drives.
I am gravitating towards a half coil wired stepper with belt drive to pinion.
3.2:1 ratio is popular, although i think higher would be better, with that in mind is this stepper motor listed on ebay a candidate?



http://www.ebay.co.uk/itm/2708951470...84.m1423.l2649

it has 8 leads therfore can be wired half coil, stated holding is 560 oz/in torque at 5.5 amps and 3.5 mh inductance.

has any one an opinion. I appreciate there has been great discussion about motor selection, but i think there are more motors on the market now.maybe to rival the accepted choices?

pauly:
Reply With Quote
  #6  
Old Sun 22 January 2012, 17:33
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
The site doesn't tell us whether the inductance is bipolar series or bipolar parallel. It also doesn't tell us whether the motor pulls 5.5A wired bipolar series, or bipolar parallel (or even half-coil).

If the motor is actually rated at 3.5 mH inductance, half-coil or bipolar parallel, then a 50VDC to 60VDC power supply would work. If the current rating matches the wiring method, then a 15A power supply should be adequate. You'll need about 20,000 uF of capacitance to smooth out the ripple.

(80,000 X Amps / Voltage = 80,000 X 15 / 60 = 20,000 uF )

Be sure that the voltage rating of the capacitors is at least 1.4X greater than the actual power supply voltage.
Reply With Quote
  #7  
Old Sun 22 January 2012, 23:53
pmesilver
Just call me: pauly
 
warwick
United Kingdom
motor question

thanks mike,
i have requested a full data sheet for the motor from the seller.

Your answer didnt seem to condemn the idea of using this motor.
maybe if i purchased one of them i could test it?

Pauly
Reply With Quote
  #8  
Old Fri 16 March 2012, 14:45
pmesilver
Just call me: pauly
 
warwick
United Kingdom
Red face progress

hi
thought i would give an update of progress.

we have completed the base frame, made from steel beams, the laser cut parts are in the workshop awaiting welding and have ordered the racks, which are 1.5 module with 26 teeth pinnions.

attached image is of my mate pete grinding the tops of the x rails after cutting.

next week we will hopefully be making the y axis gantry frame.

I am planing to make my own rollers, the bearings are on order.

they will be made from EN8 hardened and ground.


still a little undecided on motors, will deffinitely make our own gear boxes!
Attached Images
File Type: jpg 16032012.jpg (62.4 KB, 343 views)
Reply With Quote
  #9  
Old Thu 22 March 2012, 13:00
pmesilver
Just call me: pauly
 
warwick
United Kingdom
Smile more progress from warwickshire

Hi all

thought we would post a few more pictures.

Rails are now ground and profiled, using our English version of the grinding skate, design of which is copied from various forum members designs( many thanks to all).
Looking forward to assembling the frame and progressing some more.


Regards Paul
Attached Images
File Type: jpg 22032012 copy.jpg (116.5 KB, 273 views)
File Type: jpg 22032012_001 copy.jpg (114.0 KB, 273 views)
File Type: jpg 22032012_002 copy.jpg (60.8 KB, 273 views)
Reply With Quote
  #10  
Old Sat 24 March 2012, 12:17
Axel1966
Just call me: Axel
 
Paris
France
Isn't it risky to work on rails while the table is not builded ?
I thought the table must be done to adjust rails for parallelism, am-I wrong ?
Reply With Quote
  #11  
Old Sat 24 March 2012, 14:00
pmesilver
Just call me: pauly
 
warwick
United Kingdom
I cannot see any reason why.
It seems to me that the rails are only as accurate as the steel they are bolted to, there is little means to truly check that they are ground straight.
If they were ground straight on a sophisticated surface grinder, then bolted to the beams they could still be distorted!

I feel that geralds design philosophy has always been to enable the construction to be achieved in a simple workshop, and therefore limiting the accuracy to an acceptable tolerance and no more.

I will be perfectly happy with a deviation of 0.25 mm, but hey i will never know, as it is impossible to guage it.
Reply With Quote
  #12  
Old Sat 24 March 2012, 14:41
Axel1966
Just call me: Axel
 
Paris
France
Sorry, my english is not realy good, I'm not sure to explain well enough.
I mean, the holes and bolting of your rails and your X axis are fixed now.
When you will weld your X axis on your table, many things might happens.
The distance between your two Rails must be very accurate.
I guess you will unmount your rails to weld the whole table.
A small angle while welding may displace rails more than 0.25mm.

I thought I could be safer to weld the table, adjust the rails to the good shape,
then drilling, fixing and grinding to a V profile.
Maybe you have an idea to do it in a safer way ?
Reply With Quote
  #13  
Old Sun 25 March 2012, 00:12
pmesilver
Just call me: pauly
 
warwick
United Kingdom
sorry I have miss understood you.

Our table is of bolted construction, we have designed it with sufficient adjustment to allow us to align the rails for parrallelism.
I will post some pictures of the table as soon as we have assembled it.

paul
Reply With Quote
  #14  
Old Sun 25 March 2012, 09:33
Axel1966
Just call me: Axel
 
Paris
France
Ok, thanx I understand better.
Reply With Quote
Reply

Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 15:06.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.