Linear rail question

**njhussey** · 23-08-2016

If you reduce like you say then IMO there's no difference, just the same as having a 1605 geared at 1:1

**JAZZCNC** · 23-08-2016

It will be fine I do this often if require extra torque.!

**Nr1madman** · 23-08-2016

Good! Luckily I havent ordered the pulleys and belts yet ;) by the way Neil, I love your machine! Your build log is my greatest inspiration right now (and eddys build log )

**Nr1madman** · 03-02-2017

Okey fellows! Haven't decided what size for my aluminiumextrusion gantry. Been thinking about 160x80 but glancing towards the L-style way. Ran across this: http://www.motedis.co.uk/shop/Slot-p...999993754.html what do you say about this?

**JAZZCNC** · 03-02-2017

Originally Posted by Nr1madman

Okey fellows! Haven't decided what size for my aluminiumextrusion gantry. Been thinking about 160x80 but glancing towards the L-style way. Ran across this: http://www.motedis.co.uk/shop/Slot-p...999993754.html what do you say about this?

Not really suitable being only 80mm tall. However depending on size of machine 160mm will be touch on tall side. This gantry on 8x4 machine is made using 120x80mm and believe me it's more than strong enough for any router.

Click image for larger version.

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**Nr1madman** · 03-02-2017

Nice looking machine ;)
My gantry will span 100cm.. so 160 may be overkill?

**Nr1madman** · 19-03-2017

Okey! Update time.. decided on going with L style gantry using 80x40 aluprofiles.
The plan is to go vertical with the router.
Got all plates for z y and x axis machined in steel by a forumfriend. Turns out the gantry with plates, rails, bearings, motors and spindle will weigh in at about 60kgs. Sounds a bit much?
Will I be okey using cnc4you 4nm nema23 motors? 2 for the standing x axis and 1 each för y and z..? 80v digital drivers running on 68V psu I might add...

**Nr1madman** · 23-03-2017

Damn! New problem! According to drawings my linear rails use m6 bolts for fastening. Got my z axis front plate flattened and tapped. Turns out the holes in the rails are m6 but the counterbore are 9.5mm so I can't fit m6 bolthead. Should have measured first x)
Here comes the question!
Try to increase size of counterbore even though the stearingpin won't reach the center hole at first? This could create of center holes...?
Or should I drill my tapped m6 holes and use something like helicoil to reduce the holes to m5?
What would you have done?

**JAZZCNC** · 23-03-2017

Grind the Bolt head down. Put in hand drill with quick spin against bench grinder and sorted.

**Nr1madman** · 24-03-2017

Originally Posted by JAZZCNC

Grind the Bolt head down. Put in hand drill with quick spin against bench grinder and sorted.

Jazz you are a genius ;)
I'm happy I asked!

How about my other question?
Will 4 nema23 4amp motors from cnc4you drive my 60kg gantry when using the machine vertical? :D I assume 1 motor each for y and z is okey and 2 for x (standing axis)
Like I wrote I will be using 80v digital drIves with 68V psu...

Have a nice weekend