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View Full Version : BUILD LOG: Desktop type router - Fixed gantry - steel frame MK2



Tom J
21-12-2016, 08:43 PM
Hi
I would like to present you the 2nd version of desktop size router designed by myself in SW.
Hoping to mill aluminium as hardest material.


Parameters:
Working area 320x250x100mm (X.Y.Z)
Hiwin, HSR or THK 15mm blocks on Z
Hiwin, HSR or THK 15 or 20mm blocks on X
Hiwin, HSR or THK 15mm blocks on Y
3A steppers (8 cables bipolar parallel) Nema 23
Ballscre RM1605
Belts HDT 15 T20 1:1
Spindle Chinese 1.5KW water cooled
frame box 50x50x4mm
Digital drivers
CSMio/IM-M
Torus trafo 420
Soft start
Pliz safety relay
AB 24V DC
Power relay

I am limited with working size due to size of Milling machine.
All will be tig welded work started, but need your opinion before is too late.
Thank you for comments.
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routercnc
22-12-2016, 09:09 AM
Looks good Tom. Are the gantry sides aluminium profile or lots of steel box sections joined together? Needs to be steel to get maximum stiffness on this critical area.

Thanks

njhussey
22-12-2016, 11:01 PM
Looks good, I'd beef up the bed as it looks weak compared to the rest of your machine 😊

Sent from my HUAWEI VNS-L31 using Tapatalk

Tom J
26-12-2016, 01:47 AM
Looks good Tom. Are the gantry sides aluminium profile or lots of steel box sections joined together? Needs to be steel to get maximum stiffness on this critical area.

Thanks

All steel boxes welded together

Tom J
26-12-2016, 01:48 AM
Looks good, I'd beef up the bed as it looks weak compared to the rest of your machine ��

Sent from my HUAWEI VNS-L31 using Tapatalk

Neil, do you mean T-slot table or frame where blocks seats?

JAZZCNC
26-12-2016, 09:49 AM
The other weak link will be the spindle clamp. Needs more clamping area or clamp top/bottom.

njhussey
26-12-2016, 11:19 AM
Neil, do you mean T-slot table or frame where blocks seats?
T slot table, put the table on a frame or something solid, otherwise you'll get deflection and vibrations and poor finish....

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Robin Hewitt
26-12-2016, 11:54 AM
You have the rails bolted to the table, a very good start.

Second picture you go wrong. Your mind is stuck in 2D and it has put a terrible overhang on the router to gantry connection and compelled you to move the bed bearings out from under the gantry creating the awful L shape.

There is no reason why the Z axis slides have to clear the router head, they can go either side of it.

Do it again and think overhangs, think 3D :thumsup:

Tom J
26-12-2016, 02:26 PM
The other weak link will be the spindle clamp. Needs more clamping area or clamp top/bottom.

Thanks Dean
Got massive cast bracket as well, but revised 2nd option too.2008620087

JAZZCNC
26-12-2016, 02:45 PM
Second picture you go wrong. Your mind is stuck in 2D and it has put a terrible overhang on the router to gantry connection and compelled you to move the bed bearings out from under the gantry creating the awful L shape.

There is no reason why the Z axis slides have to clear the router head, they can go either side of it.

Robin think you better explain because even I can't tell where your coming from with this statement.? If your meaning what I think where is going to put the ballscrew.?

Picture will explain best.

Tom J
26-12-2016, 03:01 PM
Looks good, I'd beef up the bed as it looks weak compared to the rest of your machine ��

Sent from my HUAWEI VNS-L31 using Tapatalk

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Added T6 20mm plate:)

Robin Hewitt
26-12-2016, 03:48 PM
Robin think you better explain because even I can't tell where your coming from with this statement.? If your meaning what I think where is going to put the ballscrew.?

I can't explain, I should probably shut up, it just looks unfinished. If the router moved back towards the gantry it would look better. If the lower Z axis bearings were at the bottom of the gantry it would look better. If the bed bearings were under the gantry so it didn't depend on verticals screwed to horizontals I would be rubbing my hands together in glee and shouting whoopy do! :very_drunk:

Tom J
26-12-2016, 04:04 PM
Robin do appreciate your comments, so far I managed to skim 10mm by putting spindle closer to the plate.
Problem is that I should ask first and fabricate later. I am seating on it now - previous correction was easier to do.
I will put X axis bearing on top and bottom of the gantry - saving a lot of distance but sacrifice stiffens (extra 50mm taller legs)
Regard the bed bearings as you see from current design they are in between spindle center point - so perfect position (this will moved towards gantry later).

Tom J
26-12-2016, 07:50 PM
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now Z rails left - this will complicate fabrication, thinking now to use alloy plate and make kind of box design

Tom J
02-01-2017, 08:32 PM
some modification made to design - thanks Rob
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I managed to short less than 50mm in overhang - hope will be worth it.