First time build - Steel Frame CNC Router

[examorph]

Clive - Thanks for the advice and the heads up. I have updated the original post (#36) to show the 30mm length, will just send a copy of this to Fred Lee when ordering. One thing I am not too sure about is, do they cut this from longer material stock and give you an "extra" Xmm on top of the standard amount or do they just machine back the 30mm and as a result, reduce the original screw length?

Also, any advise on if you normally specify the accuracy and dust protection after the carriage ref ie, HGH20HA ZA C SS ?

[Clive S]

Clive - Thanks for the advice and the heads up. I have updated the original post (#36) to show the 30mm length, will just send a copy of this to Fred Lee when ordering. One thing I am not too sure about is, do they cut this from longer material stock and give you an "extra" Xmm on top of the standard amount or do they just machine back the 30mm and as a result, reduce the original screw length?

Also, any advise on if you normally specify the accuracy and dust protection after the carriage ref ie, HGH20HA ZA C SS ?

I don't think you are understanding this. I see that you have altered the F length to 30mm but you have not altered the overall length.

The overall length = the end for the BF bearing then the screw part then the BK bearing including the threads and the F length So L = the total length .


Ask Fred for the quotation and he will get back to you very quickly usually within about 36 hours.

Edit I think you did alter the length but check

[examorph]

Ahh thanks for clearing that up, it was me being daft!!! I understand it now.

Do you by any chance know if he also does some of these: http://www.ebay.co.uk/itm/Ball-Nut-M...c=1&rmvSB=true
Might be easier getting them off of him as i'm paying for the shipping anyways.

[Clive S]

Ahh thanks for clearing that up, it was me being daft!!! I understand it now.

Do you by any chance know if he also does some of these: http://www.ebay.co.uk/itm/Ball-Nut-M...c=1&rmvSB=true
Might be easier getting them off of him as i'm paying for the shipping anyways.

When you ask him for the quote include a picture of the ball nut mounting.

But before you order have you designed the frame that you are going to mount it all on as you might need different mountings than those.

It usually only takes about 10 days to get the stuff from Fred.

[examorph]

Clive - Thanks for the advice. Not sure what other types of mountings are available (other than the ones Chai does). Only place I see this being a concern is possibly on the Z-Axis where I might end up being short for space. I drew the below ball nut supports as reference (not to scale) and was planning on correcting the sizes when I received/measured the components:
Attachment 17504Attachment 17505Attachment 17506

Also, adjusted the ball screw F dimension and during checking noticed that the Y-Axis needed shifting towards the right to line up with the motor:
Attachment 17507

[examorph]

I have been doing some shopping around for quotes and would like some advice please.
For the linear components the following is what I got back:

Chai = $738 = £510
Fred = $958 = £663
FYI - Local Supplier = >£3,000!!!
The shorter carriages were £100 less in total if I went for them.

Ideally it would be Chai with the shorter carriages but two disadvantages seem to be, hes using a different brand of rails/blocks and also, i'm not sure if the shorter carriages will be enough for possible long term aluminium work. What do you guys think please?

Also, does £140 sound like a good deal for all the aluminium and steel plates (gantry sides, full z axis, bearing supports, spacers, etc)?

[Boyan Silyavski]

comparing Hiwin to Chinese rails is like apples to oranges. Fred also has the Chinese rails by the way and of course they are cheaper. If you are doubting £100 in a build of 2500, then definitely go with the cheaper.

I am saying this cause if you really want to cut aluminum when you pay 500 for a plate you will forget the 100 you ar doubting now.

140 sounds a good deal if they are precut. Depends though, i buy pre-cut aluminum plates any thickness at 5euro/kg +vat here in Spain. And steel at 1eur/kg but i have the means to cut it.

[JAZZCNC]

I have been doing some shopping around for quotes and would like some advice please.
For the linear components the following is what I got back:

Pay the £100 extra and get Hi-win from Fred Lee. Also don't need long carriages to cut aluminium the short ones work fine. I've got some Hi-win rails carriages (short) here that where fitted to my old router which cut nothing but aluminium for 5-6yrs and they are still good day fitted and they where second hand then.!!

Also, does £140 sound like a good deal for all the aluminium and steel plates (gantry sides, full z axis, bearing supports, spacers, etc)?

How longs a piece of string.? How can anyone tell you that without knowing dimensions and amount of aluminium.?