noobie

[jonm]

hi all
been reading this forum now for a while, picking things up from you guys and i am now ready to start my build which will be a wood router , i have ordered from zapp 3 nema 24 3nm steppers, 2 1200mm long fully supported 16mm round rail 4 open bearings . going to use 12mm trapeziod 3mm pitch for drive , i have a block of derlin from ebay to make nuts , and have made a tap from a piece of trapeziod, slowly gathering parts together, would 2.5 amp drivers be enough or do i need 4 amp, the attachment is a section through the x axis would this work , i would like to make the y axis stiff enough so as to drive the x axis from one side only , any help would be appreciated

[Gary]

the SY60 will run from either 3A in unilpolar, 2.1A in series (Bipolar) or 4.2A in Parallel (Bipolar)
So the answer is yes the motors will run in series with a 2.5A driver, but dont expect to get the machine running very fast, unless you connect in parallele and give it at least 40V.
I doubt you will be able to run from the center, even with a stiffer machine using profiled rail can crab, and you are using MDF and this will cause you big problems.
Even running the screw through the center will still casue you problems.

hi all
been reading this forum now for a while, picking things up from you guys and i am now ready to start my build which will be a wood router , i have ordered from zapp 3 nema 24 3nm steppers, 2 1200mm long fully supported 16mm round rail 4 open bearings . going to use 12mm trapeziod 3mm pitch for drive , i have a block of derlin from ebay to make nuts , and have made a tap from a piece of trapeziod, slowly gathering parts together, would 2.5 amp drivers be enough or do i need 4 amp, the attachment is a section through the x axis would this work , i would like to make the y axis stiff enough so as to drive the x axis from one side only , any help would be appreciated

[HiltonSteve]

I doubt you will be able to run from the center, even with a stiffer machine using profiled rail can crab, and you are using MDF and this will cause you big problems.
Even running the screw through the center will still casue you problems.

Have to agree with Gary here, using open bearings will always cause you crabbing problems which is why I dismissed them for my design, but driving from both sides will soon sort that out.

Though, I have built up my X axis gantry yesterday on my machine which has a bed size of 1000mm x 600mm and using 20mm THK linear bearings gets virtually no crabbing, I will be driving this machine from the centre. It is a pretty solid all aluminium machine which does help though. will get a clock gauge on it later to measure it but it is not a lot.

Gary - Don't forget to send me those 16mm ballnuts when they come in, they are the only piece missing now before I can get up and running.

[Gary]

The ball nuts leave the factory on the 20th so i expect them to arrive mid week (Wednesday / Thursday.)

Have to agree with Gary here, using open bearings will always cause you crabbing problems which is why I dismissed them for my design, but driving from both sides will soon sort that out.

Though, I have built up my X axis gantry yesterday on my machine which has a bed size of 1000mm x 600mm and using 20mm THK linear bearings gets virtually no crabbing, I will be driving this machine from the centre. It is a pretty solid all aluminium machine which does help though. will get a clock gauge on it later to measure it but it is not a lot.

Gary - Don't forget to send me those 16mm ballnuts when they come in, they are the only piece missing now before I can get up and running.

[HiltonSteve]

The ball nuts leave the factory on the 20th so i expect them to arrive mid week (Wednesday / Thursday.)

Nice one!

May be up and running by next weekend then.

[jonm]

thanks for the input guys , may bin the mdf idea seen aluminium herehttp://www.aluminium-profile.co.uk/a...10mm_Slot.html

could get a frame for about £60 ,would it crab with 2 bearings per rail spaced say 200mm , could i run two skate bearings against the outside of the frame on the non driven side to keep it parallel and stop the racking , i have aready ordered the 16mm rails from zapp

[HiltonSteve]

The ball nuts leave the factory on the 20th so i expect them to arrive mid week (Wednesday / Thursday.)

Attn - Gary - Zapp Automation

Sorry to hijack the thread again but I really need my ballnuts now...

Have you got them in yet and any idea on delivery?

[Gary]

They were sent to you the other day, so you should get them today.

Attn - Gary - Zapp Automation

Sorry to hijack the thread again but I really need my ballnuts now...

Have you got them in yet and any idea on delivery?

[John S]

Kip, got two 6' lengths of about 8DP rack, no pinions that's only suitable for a gate or similar you can have.

BTW saw a gate mechanism, home made that used one of those motorised liner ballscrew assemblies. He'd mounted the fixed point behind the pivot point in X and Y to be technical so it had a mechanical advantage and the 10" or so travel was enough to swing a big 5 bared gate.