MK1 Steel router build log 1500x800x200

[Clive S]

Hi guys,



A little progress update.

First layer of paint two tone black and white.


What do you guys think?


grtz Bert.



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Can't see the gantry moving yet.

[driftspin]

Can't see the gantry moving yet.

Hi Clive S.


Hahah no, no movement yet.

Progress is slow.

Work related issues use up near all of my time. Well it pays for the bills.


I am still working on the gantry.
I need to get some bracing in, in the gantry uprights. Also i need to finish beefing up the mounting surfaces, some welds need finishing.



When all that is done the big pour is next.


After that a lot of big decisions are to be made.

I am near ready to order the linear parts.

I need advice on ballascrew end machining for pulley's.


Also .. will quality angle bearing bf bk type blocks fixed / float setup do?

Does one gain lots of rigidity by going fixed fixed? is it much more complicated to setup ?

I am now designing based on fixed/float setup.

So maximum speeds vs screw rpm vs pitch vs screw length and diameter are based on fixed float.


Grtz. Bert










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[routercnc]

Looking good but I would have added another member to the top of the black frame work to support the underside of the white cross members. Not too late to bolt something in and shim or epoxy any gaps.

Fixed float is fine for the screws but I'm thinking of fixed fixed on my long axis (as per Boyans machine) to reduce a slight buzz / vibration when the machine is towards one end. In theory you might worry about heat and expansion but for the amount I use my machine and the speeds etc I think it is a low risk. Not sure yet but might make it with a spring preload . . . Or keep it simple and lock it in place.

[driftspin]

Looking good but I would have added another member to the top of the black frame work to support the underside of the white cross members. Not too late to bolt something in and shim or epoxy any gaps.

Fixed float is fine for the screws but I'm thinking of fixed fixed on my long axis (as per Boyans machine) to reduce a slight buzz / vibration when the machine is towards one end. In theory you might worry about heat and expansion but for the amount I use my machine and the speeds etc I think it is a low risk. Not sure yet but might make it with a spring preload . . . Or keep it simple and lock it in place.

Hi router CNC,


There will be 4 bolt on diagonals from the middle crossmember when electric panel and additional equipment is fitted.

Grtz Bert.



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[driftspin]

Hi guys,


I am about ready for the big pour.
Planning to do it this week or next.

I plan to put the frame under a tarp with a thermostat controlled heater during curing.
And set it to 25 C.



Now i need some looking over my shoulder before ordering linearcomponents.

I have a quote from Fred.

The shopping list:

Rail.
2pcs HIWIN HGR20-L1830mm Linear rail

2pcs HIWIN HGR20-L1000mm Linear rail

2pcs HIWIN HGR20-L500mm Linear rail

12pcs HIWIN HGH20CA Linear carriage



Ballscrews rolled C7.

End machining fixed float for a pulley

Z-axis
1set C7 RM1610-L350mm Ball screw with ballnut

Change Length F to 30mm*

Y-axis
1set C7 RM1610-L1150mm Ball screw with ballnut

Change Length F to 30mm*


X-axis
2 sets C7 RM2010-L1700mm Ball screw with ballnut

Change Length F to 30mm*

2pcs 1610 Ballnut Housing

2pcs 2010 Ballnut Housing


2 sets bk bf12 1610

2sets bk bf15 2010

Upgrade all of the 4set BK/BF* to Superior bearing type.


Any thoughts?


Grtz Bert




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[driftspin]

Next question.

M5 bolts for rail and carriages .

Will a typical hex 8.8 / 12.9 m5 x20 do?

What did you guys buy?


Grtz Bert.



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[Clive S]

Next question.

M5 bolts for rail and carriages .

Will a typical hex 8.8 / 12.9 m5 x20 do?

What did you guys buy?


Grtz Bert.



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Remember the F length 30mm is in the total length on the screw.

The bolts used are generally cap heads

[driftspin]

Remember the F length 30mm is in the total length on the screw.

The bolts used are generally cap heads

Hi Clive,

Yes, i discussed this with Fred.

He is a patient guy .

I want some spare cm of travel in the Z design... i am not sure i like the height of the z axis though.. I like compact.

I want the extra head room in z ballscrew for MK1a gantry...

what ?!!! NO NO NOO... 🤤🤤🤤


No.. im not sure 80x 120 will do and calculate in a design change to a more beefy gantry ....some day... with more travel...


Well i want at least 200mm +Z travel.. so

Travel + nut + bf bk + F = 30 for pully =
+/- 320 .. so 350 for Z should do.



Grtz Bert



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[Boyan Silyavski]

Next question.

M5 bolts for rail and carriages .

Will a typical hex 8.8 / 12.9 m5 x20 do?

What did you guys buy?


Grtz Bert.



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Din912

[driftspin]

Din912

Yes those.. exactly.

But... 8.8 or 12.9

Like your good ol bolts or tougher machine bolt style.

Does one need high tensile strenght?

I will be tapping in the 4mm steel from box section for the rail. all 200 or so off them.

Carriage bolts will have some extra meat to grip on to (4+5 mm) it has less bolts so ... well more doesnt hurt there.

Grtz Bert.

PS
Where does one buy kinda good machine taps for this purpose, not sure what makes an economical machine tap.








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