Debating 3977 3 axis

[pminmo]

I've had this design done for a couple of months. It's a 3 axis all in one design based on the Allegro A3977SED. (connector for connection to a 4th axis via one of the Open soucre boards) To be perfectly honest, right now I just don't have the time, energy and spare cash to order, build and checkout. A LOT of the design is cut and paste from previous designs, so it should be pretty low risk. If there is a person(or persons) out there that is interested in persuing building one for themselves, willing to help pay for the proto board's, contact me offline. Needs to be somebody that is not a novice to electronics, and doesn't need a lot of mentoring. You should be able to get a board and the parts for around $75 without the A3977SED's.

Phil

[zoltan]

Hi Phil,

Right now I started to build joe's version of 3977. I have built the boards. Actually, I found out another local supplier of presensitive boards which are working great with my homemade UV box. Unbelievable what quality in just 2 min. I made three boards of 3977 and three of picstep and they are without any defect. Not even a deviation of width of trace under a microscope!!! So, to make the long story short. Send me the files (Eagle) and I will build it. I bought six broken printers (mechanics failure) with 3977 SED inside.

Zoltan

[pminmo]

It's a double sided board. Much finer pitch than the others.

Phil

[philba]

how are you guys soldering the PLCC 3977?

My first attempt at hand soldering was a complete disaster - several bridges that no wick would get (i've got the really thin stuff for smd). I've got a hot air station so I may try that or maybe the sparkfun hotplate method. Any suggestions?

I haven't got any solder paste (yet...). Would just tinning the pads and fluxing the leads do ok? Should I tin the leads as well? I'm going to make some test boards for a sacrificial PLCC test, hopefully today (after I fix my shop lighting that the *!1&^%!! electrician left in a mess. grrrrr).

[HobbyCNC]

Originally Posted by pminmo I've had this design done for a couple of months. It's a 3 axis all in one design based on the Allegro A3977SED. (connector for connection to a 4th axis via one of the Open soucre boards) To be perfectly honest, right now I just don't have the time, energy and spare cash to order, build and checkout. A LOT of the design is cut and paste from previous designs, so it should be pretty low risk. If there is a person(or persons) out there that is interested in persuing building one for themselves, willing to help pay for the proto board's, contact me offline. Needs to be somebody that is not a novice to electronics, and doesn't need a lot of mentoring. You should be able to get a board and the parts for around $75 without the A3977SED's. Phil

Got a parts list to go with it?

Dave

[pminmo]

philba,
Fine soldering iron and a flux pin. I use a .032 round tip.

Hobbycnc,
I haven't ordered a pcb yet. I've actually tweeked the design some by making it opto isolated.

[HobbyCNC]

Originally Posted by pminmo philba, Fine soldering iron and a flux pin. I use a .032 round tip. Hobbycnc, I haven't ordered a pcb yet. I've actually tweeked the design some by making it opto isolated.

Hmm...You ask for help in prototyping it and I wanted to see the BOM. How can someone help without a BOM?

Dave

[pminmo]

Originally Posted by pminmo If there is a person(or persons) out there that is interested in persuing building one for themselves, willing to help pay for the proto board's, contact me offline. Phil

Dave,
I'm not sure what part of the message you didn't undertand.

[HobbyCNC]

Originally Posted by pminmo Dave, I'm not sure what part of the message you didn't undertand.

You ask for help in building one and I'm asking what the BOM contains to understand what's involved in helping you build one.

Dave

[pminmo]

Qty	Value	Device	Parts
1		F25HP	X8
2		G04R	RN2, RN3
1		LED3MM	LED1
3		Header-1X2	JP2, JP5, JP10
2		Header-2X5	JP7, JP9
3		R-TRIMM64W	R29, R35, R38
17	.1uf	2.5mm ls 35vdc	C6, C8, C21, C22, C25, C26, C27, C28, C29, C34, C35, C36, C37, C38, C45, C46, C47
6	.2	2512smd 2W	R11, R12, R15, R16, R19, R20
1	.22uf	2.5mm ls 35vdc	C20
9	.22uf	1206 smd 35vdc	C2, C4, C5, C9, C10, C11, C12, C15, C16
10	1K	1/8W	R2, R4, R24, R33, R36, R44, R47, R48, R52, R53
5	2.2K	1/8W	R23, R32, R34, R45, R46
2	2N2222	2N2222	Q1, Q2
6	4.7K	1/8W	R13, R17, R21, R22, R26, R30
1	10K	1/8W	R3
6	10K	1/8W	R5, R6, R7, R8, R9, R10
1	10uf tant	2.5mm ls 16VDC	C7
6	51K	1/8W	R14, R18, R25, R27, R28, R31
2	74HC14D	74HC14D	IC2, IC3
6	100uf	2.5mm ls 35vdc	C1, C3, C13, C14, C17, C18
2	390	1/8W	R1, R54
1	470pf	2.5mm ls 35vdc	C19
9	680	1/8W	R37, R39, R40, R41, R42, R43, R49, R50, R51
6	1000pf	2.5mmls 35vdc	C23, C24, C30, C31, C32, C33
1	7805	7805 to220	IC1
3	A3977SED	A3977SED	U$1, U$2, U$3
1	ISO5V	W237-02P	X9
1	NKE0505S	NKE0505S	DC1
1	TLP624	TLP624	OK4
4	TLP624-2	TLP624-2	OK1, OK2, OK3, OK5
1	VDC	W237-02P	X1
1	XO1	W237-02P	X3
1	XO2	W237-02P	X2
1	XRate	Header-2X2	JP1
1	YO1	W237-02P	X6
1	YO2	W237-02P	X4
1	YRate	Header-2X2	JP3
1	ZO1	W237-02P	X7
1	ZO2	W237-02P	X5
1	Zrate	Header-2X2	JP4

Header reference .1 spacing male IDC header
W237-02P reference 2 pin screw terminal

[philba]

Originally Posted by zoltan Hi Phil, Right now I started to build joe's version of 3977. I have built the boards. Actually, I found out another local supplier of presensitive boards which are working great with my homemade UV box. Unbelievable what quality in just 2 min. I made three boards of 3977 and three of picstep and they are without any defect. Not even a deviation of width of trace under a microscope!!! So, to make the long story short. Send me the files (Eagle) and I will build it. I bought six broken printers (mechanics failure) with 3977 SED inside. Zoltan

what printers have the 3977 in them?

[zoltan]

Hi,

They have been some industrial printers - Oliveti. They have been used on assembly lines.I bought in total 10 pcs, all of them not working, as I was told they had some mechanical problems (the guy who brought them to the recycling company told me), but only six had A39977 inside and the other four, same type, had controllers with A6615SED (I did not check what IC is it). I did not record what was the name of printers, but for sure they have been Oliveti because I did not pull out all the components from boards and I still have them. As here you do not find very easy new parts and when you find out they are very expensive, I am buying broken or old printers, scanners, faxes, cashier counters, etc from a recycling company. Because they sell everything by kilograms I am going there and disassembly on spot the equipments and pull out the boards, motors, etc, and pay only for kg of material I want.

Be aware that you can not desolder A3977 without a hot air gun.

Zoltan