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Archive for August, 2011

Mounting the Dell 5100MP

August 15th, 2011 9 comments

A little more progress made. I have mounted the projector to the frame.

Supplies:

Washers 18mm x 1mm M6 – 10pcs.

Socket wrench + 10mm socket.

Screwdriver ( No, not the one with the Orange Juice! It is too early to drink! ) depending on the M3 bolt heads.

M3 x 25mm bolts – 3pcs.

M6x20mm bolts – 3pcs.

Standoffs – 18mm x M4 – 3pcs.

 

For the purpose I dug up an old aluminum heat sink (120mm X 150mm) , but you can use an aluminum flat piece 4mm thick and with a proper size for your projector mounting holes. Disregard the 90 Degree bend.

The easiest way ( since projector manufacturers do not provide you with a bolt pattern like water heater manufacturers do) to create and transfer the mounting hole location is on a piece of paper. Mark the hole locations and attach with tape to plate ( after you center it, of course ), and drill the holes ( in my case on the 5100MP they are 3mm ) a little bigger ( 3.2mm ) than the bolts to be used. Check for fit. Check that no vent or air holes are blocked ( read further below and you will see ).

Then drill holes for the bracket to frame bolts 6mm ( similarly a little bigger that the bolt size 6.2mm).

As in the post about the Power supply, get more washers than just needed ( these are also 18mm, but for the M6 bolts ) and M6x20mm bolts.

I used 3 M6 in a horizontal pattern – did not follow some specific distance between them, just two near the end and one in the middle.

 

As seen I had to add spacers, because the mounting plate covered a vent hole on the bottom of the projector and also to clear the washers and nuts used to mount the plate to the frame.

I had to also countersink the M3 x 25mm bolts a little(2mm)with a 5mm drill bit, so they screw in further in the projector frame and I have a more secure projector-plate connection.

And the end result looks like this:

Nicely done! Now you can get that screwdriver with Absolute.

 

Stepper Motor Drivers

August 13th, 2011 No comments

And speaking of the drivers:

I have chosen the IMS drivers for their reliability, simplicity, size and characteristics .  I already have them in my CNC mini mill and am content. I have worked with them before at a CNC machine shop.

I had used all 4 IM483 and only had exactly 2 IM804 left. The 804 can handle higher input voltage ( 24V to 75V ) and output current is at 4A RMS.

For those who are familiar with the IM804: Yeah, I know it is overkill, but for the fact that I did not have to spend more money, they will do the job nicely. BTW: IMS was acquired by Schneider Electric a few years back – http://imshome.com.

 

Categories: Z-Motion Tags: , ,

Power Supply for the steppers

August 13th, 2011 3 comments

I have chosen an old power supply from HP 32V 2.2A for the steppers since the NEMA17 is not over 0.7 and the NEMA23 will be limited to 1A. I have chosen to mount it temporarely via some washers in the channel and brackets.

Washers – wide 18mm(5mm internal)x1mm ( I will use them all over the place so get at least 50)

Bolts – any head 20mmx4mm will do ( again take at least 20 )

Brackets – 40mmx40mm right angle for wood frame

Held in place by zip ties.

You can get a dedicated power supply and depending on your motors choose a higher rated Amps.

Rule is generally add your stepper driver limit +5%~10%. No point in wasting money on more power than that.

In my case I will limit the Amps via the stepper drivers to collectively 2A and it will not be even at 25% duty cycle (calculating from 8sec exposure and 2sec tilting cycle).

Categories: Frame Tags: , , ,