First time build - Steel Frame CNC Router

[examorph]

Boyan - Thanks for the advise, I will look into the distance and confirm the 2cm as per your comments.

Are there any advantages to using the longer type carriages? Models are based on the shorter ones 'CA', and using the longer 'HA' type carriages will further reduce the cutting area.

[Boyan Silyavski]

Boyan - Thanks for the advise, I will look into the distance and confirm the 2cm as per your comments.

Are there any advantages to using the longer type carriages? Models are based on the shorter ones 'CA', and using the longer 'HA' type carriages will further reduce the cutting area.

Depends on what you want to cut. as they are very similarly priced and i wanted to cut aluminum i like the long ones. But i like also to overbuild a bit :-) . For wood i dont think it matters anyway

[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 ?