Stell frame cnc 1500X1000. Adjustable table your opinion please

[Boyan Silyavski]

That with the long screws holding the plate is great idea, thanks for sharing the photos. I will do the same, as i don't have long clamps.

All looks very good!

I fully welded the gantry on the machine i finished and spot welded the Z. Now that you have all in place why don't you repeat the spot welding until all spot welds are very close?
If it was me, i will fully weld it, though it seems that will work both ways. Welding precisely takes a lot of time , i know. I made 5cm stitches, and took care that the temperature of the gantry not to rise above 60 degrees. Used an infrared thermometer. And had to wait a lot for the metal to cool.

You were lucky if your long plate was straight. I had to hammer down to rectify some of the laser cut stuff. Good that i have very big plastic head hammers.

[ba99297]

That with the long screws holding the plate is great idea, thanks for sharing the photos. I will do the same, as i don't have long clamps.

Now that you have all in place why don't you repeat the spot welding until all spot welds are very close?
If it was me, i will fully weld it, though it seems that will work both ways. Welding precisely takes a lot of time , i know. I made 5cm stitches, and took care that the temperature of the gantry not to rise above 60 degrees. Used an infrared thermometer.

Syliavski i think ( not sure, that is why i ask ) that i have nothing to add to the stiffness of the machine. One small spot weld is too strong . On the other hand too much heat may cause deflection and twist . Dont forget that my machine is bigger than yours ( y axis is 1160mm long) so it is more possible to have twist issues.

You were lucky if your long plate was straight. I had to hammer down to rectify some of the laser cut stuff. Good that i have very big plastic head hammers.

I think it is not but when i bolt it on the tube construction it will be as straight as the tubes. Even then i am not sure everything will be straight. May be machining or epoxy method will be applyied.
I have a small problem with the resign. The Greek supplyer of West system epoxy doesn have the 209 hardener. On the other hand the 209 hardener is not easy to be shipped as it is described as dangerous to travel . I have to look for another resign

Vagelis

[Clive S]

I have a small problem with the resign. The Greek supplyer of West system epoxy doesn have the 209 hardener. On the other hand the 209 hardener is not easy to be shipped as it is described as dangerous to travel . I have to look for another resign
Vagelis

Well check here:- http://www.ebay.co.uk/itm/West-Syste...item1e8ff2bb79 I know this is not a good place to buy it but they do ship to your country . Have you tried to buy it from the UK or perhaps tried a boat yard, also ask them why they can ship the 205 but not the 209. Wests is the best product and it gives you about a 10 hour cure. ..Clive

[ba99297]

Well check here:- http://www.ebay.co.uk/itm/West-Syste...item1e8ff2bb79 I know this is not a good place to buy it but they do ship to your country . Have you tried to buy it from the UK or perhaps tried a boat yard, also ask them why they can ship the 205 but not the 209. Wests is the best product and it gives you about a 10 hour cure. ..Clive

The Greek supplier can ship me the 105 epoxy and the 205-206 hardener but he doesn’t import the 209 hardener.
Other sites even from uk they cant ship (via air) any hardener. Find them

http://www.ecfibreglasssupplies.co.u...acks-12kg.aspx
i think they are cheap at their prices but i emailed them and they answered

"HI Unfortunately we do not stock this product abd cannot ship outside of the Uk due to hazardous content, you may be best to contact west system direct for nearest distributor. Sorry we could not assist with your enquiry . Kind rgds Martin"

As searching i saw that some datasheet measure the viscosity at cps and others at mpa.s. I don’t know what is the difference as when i google search for a converter

http://www.aqua-calc.com/convert/dyn...cond/start/165
i see that they are equal


I found a company CARBON MODS

http://www.carbonmods.co.uk/products...arter-kit.aspx

that sells its products through this site
http://www.easycomposites.co.uk/

At this site
http://www.easycomposites.co.uk/prod...ion-resin.aspx

i found an infusion epoxy resign
here is the datasheet
http://www.easycomposites.co.uk/down...sion-Resin.pdf

From a first reading it seems to have ( according the numbers of the datasheet ) smaller combined viscosity (225 mpa.s) than 105+209 hardener resign (650 cps ) , also it has pot life 80-100 minutes (slow hardener ) smaller than 105+209 (40-50 minutes) , and the price is 18.42+vat pounds.
I don’t know which product is better for our application.


but when i go to the transport details page
http://www.easycomposites.co.uk/dang...-shipping.aspx

Greece is at the red list

Thanks for your participation

[EddyCurrent]

This is the stuff I used, worked fine.
http://www.reactiveresins.com/syntac...poxyresins.pdf

[Boyan Silyavski]

This is the stuff I used, worked fine.
http://www.reactiveresins.com/syntac...poxyresins.pdf

Edyy, was it cheaper you said?




Did you checked the link i provided you. For sure they ship, as i have it in my garage

Here is another link, they ship also PS. deleted the last link, very expensive.

From a first reading it seems to have ( according the numbers of the datasheet ) smaller combined viscosity (225 mpa.s) than 105+209 hardener resign (650 cps ) , also it has pot life 80-100 minutes (slow hardener ) smaller than 105+209 (40-50 minutes) , and the price is 18.42+vat pounds.
I don’t know which product is better for our application.

Its not only that. There are other things important for leveling the rails. The compression yeld, surface quality and precision.

[ba99297]

I am confused
First of all they dont ship to Greece ( may be to other countries but not to Greece) any epoxy because it is dangerous
The Greek supplyer doesn import the 209 hardener
I find other epoxy systems but every one has different datasheet parameters
For example west system says pot life of 100gr at 22 C, other says pot life 1lt at 25 C. How to compare?
Also it is not clear what everybody mean by saying Pot life, gel time, working time. I call them . One says all the above are the same, other says they are not. I have not a way to compare.
I find one Greek supplyer that has an australian product Megapoxy HX
This product has 60 cps viscocity and working time according the greek site (english version ) datasheet 30 minutes


http://www.megapoxy.gr/index.php?pN=...ProductID=6283
and the datasheet here

http://www.megapoxy.gr/images/pdf/Me...tion_%20En.pdf

and according an australian site (english version ) datasheet

http://www.permatech.com.au/tds/megapoxy_hx_tds.pdf 60 minutes.

What i should believe?

Also its compressive strength is bigger than west system (13778 PSI vs 12000 PSI )
For sure viscocity is very low ( ten times smaller than west system) , but working time also


Thanks for your time

Vagelis

[Boyan Silyavski]

Apart from stiffness there is dampening of vibrations to consider. Not fully welding may worsen things there. I have never seen commercial mill or cnc spot welded, that should be enough answer for you.

Not every one uses epoxy. I believe it helps dampening. There is German company selling something similar, it was called Moglis, I am not sure. Will search, I had the link somewhere. It's meant to be used for shimming the rails. You can do that with normal epoxy, though the proper one has high compression rating without deformation.
Shimming definitely will be cheaper. But then you will need long straight edge.