First time build - Steel Frame CNC Router

[examorph]

I also want to be cutting aluminium, so updated the models with the longer carriages (CAD models from here) and replaced the rear hard stops with large bolts (will use a steel plate spacer on the inside of the box section to support these). One thing I cant figure out is if I was unlucky enough to hit the hard stops, would it not end up distorting the frame and cause more problems?

Anyways, the larger carriages didn't make that big of a difference to the work area and seemed to fit OK with the existing setup (slight overhang though) so all in all, seems to have worked out ok.
Attachment 17484Attachment 17485Attachment 17486Attachment 17487Attachment 17488
I have shown carriage spacing for each axis. Can I reduce or need to increase it anywhere?

[examorph]

Do you guys thinks i'm now OK ordering in the linear components? If so, hoping you could help me with a few things:

Linear Rail -
2 x Hiwin HGR20- 300mm linear rail
2 x Hiwin HGR20- 600mm linear rail
2 x Hiwin HGR20- 1050mm linear rail
12 x HGH20HA ZA Hiwin block
Do you normally tend to specify the accuracy and dust protection indexes as part of the carriage/rail refereces when ordering from Fred Lee?

Ballscrew -
1 x SFU / RM 1605-L250mm Overall length- C7 ballscrew with a ballnut with end machined and increase dimension F on end machining to 30mm for pulley
1 x SFU / RM 1610-L650mm Overall length- C7 ballscrew with a ballnut with end machined and increase dimension F on end machining to 30mm for pulley
2 x SFU / RM 1610-L1050mm Overall length- C7 ballscrew with a ballnut with end machined and increase dimension F on end machining to 30mm for pulley
4 x BK / BF 12 support for ballscrew

If you spot anything out, please let me know.

[Clive S]

Personally I would specify the F length to be 30mm ( you can always cut it shorter)

[Clive S]

examorph I forgot be very clear when you order the screws that that you quote the total length of the screw including the F length. ie. 1605-L250mm including F=30mm length .

If you decide on the extra 5 mm don't forget to change your sizes

[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.