2020 Goals - Soldering an Eggfinder

Help Support The Rocketry Forum:

SecondRow

Well-Known Member
So I picked up a LOC Norad Pro Maxx recently - I like the look (I like transitions). It looks like this will be a good rocket to fly on our non-waiver field with F and G motors, and also something I can take to our smaller HP field for H and I fun. If it flies well on those, I might try for level 2 on a J at our big field next November (Goal #1). OR is predicting an altitude of around 4400 ft.

I can hear some of you now: "SecondRow, don't go so high for your L2 flight! Use big, dumb 4" rockets, not a light 3" rocket that transitions to 2.26"! You're being foolish." Probably, but I'm comfortable using my JLCR (my L1 was to 2800 ft with the chute release), and this should be fun. I also plan on using a tracker. Researching the different options, I decided I want to build an Eggfinder (Goal #2). But there's just one sticking point, I've never soldered anything before. So, I need to learn (Goal #3 - probably should have been Goal #1) if I want this to work right. Plus, it's time to learn a new skill.

And that's what this thread is going to be over the next couple months: learning how to solder, improving my skills, getting you guys to critique my work. All for the end goal of trying to build the Eggfinder. Also, a place to put any information I find elsewhere that I think will come in useful down the road. Oh, and a place to ask lots of stupid questions.

First up is a couple threads I found and liked:

Last edited:

SecondRow

Well-Known Member
First couple questions are Eggfinder specific. I want to make sure I understand the system. I know I could ask EggTimer, but since I don't plan on buying the kits for a couple months, I didn't want to bother them at this point. So this is a way for me to remember these questions down the road. But if anyone (especially cerving) wants to answer, I'll be grateful.

1. I know I need the Tx. The question is which receiver assembly to get. As far as I understand, to get the coordinates from the Rx I would need a laptop or an android phone. Am I correct?

2. If that’s the case, I will probably get the LCD receiver. I’ve got an iPhone and don’t have a laptop other than my work computer. I don’t think corporate security would appreciate the situation, so I’ll get the LCD.

3. With the LCD, I would have to plug the coordinates into my phone, right? And if I get the GPS module add-on to the LCD, then I don't need my phone. The LCD will tell me where to go, correct?

g.pitts

Well-Known Member
TRF Supporter
First couple questions are Eggfinder specific. I want to make sure I understand the system. I know I could ask EggTimer, but since I don't plan on buying the kits for a couple months, I didn't want to bother them at this point. So this is a way for me to remember these questions down the road. But if anyone (especially cerving) wants to answer, I'll be grateful.

1. I know I need the Tx. The question is which receiver assembly to get. As far as I understand, to get the coordinates from the Rx I would need a laptop or an android phone. Am I correct?

2. If that’s the case, I will probably get the LCD receiver. I’ve got an iPhone and don’t have a laptop other than my work computer. I don’t think corporate security would appreciate the situation, so I’ll get the LCD.

3. With the LCD, I would have to plug the coordinates into my phone, right? And if I get the GPS module add-on to the LCD, then I don't need my phone. The LCD will tell me where to go, correct?
@cerving is active here and may weigh in.

PatD

Well-Known Member
TRF Supporter
Correct. Either transmitter with the LCD receiver and GPS module will get you what you want. When you get ready, call the company and talk to them. You will need a data cable also. cerving is the boss on this.

SecondRow

Well-Known Member
Next up is equipment related. What to buy to get started practicing. From reading the EggFinder instructions and the TRF threads, it seems like I need:

1. an iron that capable of variable temperatures, with a small conical tip.
2. a brass sponge.
3. good tweezers
5. A good light source
Edited: 6. A solder wick
Anything I'm missing?

I was thinking about spending in the $30-$40 range for a soldering station. Is this is a good choice? It has a temp range of 200-480° and comes with a 0.2mm conical tip: https://www.amazon.com/Aoyue-Variable-Soldering-Station-Removable/dp/B00MCVCHJM

Last edited:

PatD

Well-Known Member
TRF Supporter
No experience with that soldering station, so no opinion. You will need additional soldering tips, some good solder like Kester brand, flux and pretinner is a good thing to use. Magnification for assembly is the subject of discussion. Depends on your eyes I suppose, but most suggest lower magnification for assembly (2-4X give or take) and higher mag (10-20X for inspection). Some with young eyes use no mag for assembly so YMMV.

Last edited:

Voyager1

Well-Known Member
TRF Supporter
Flux pen or syringe. Perhaps an anti static mat.

Thorfire

Well-Known Member
These things make building eggfinder a lot easier for me:
+MAGNIFICATION - I use an old stereo microscope that was headed for the dumpster at work.

SecondRow

Well-Known Member
Revised materials list (I can't edit the original post anymore), thanks to your suggestions:

1. an iron that capable of variable temperatures, with a small conical tip (+ extra tips).
2. a brass sponge
3. good tweezers
4. A magnifier ( 2-4x for assembly, 10x for inspection)
5. A good light source
6. A solder wick, solder sucker
7. solder, flux, pretinner (Kester)
8. anti-static mat
9. fume extractor

Not sure I'll get everything on the list at first. Depends on cost and the space I have available. I'm currently frozen by the paradox of choice for the iron. I think I've watched dozens of youtube videos on soldering stations.

SecondRow

Well-Known Member
Stupid question #2: I've seen it suggested to use a small conical tip. But what's "small" in this case? The smallest I've found is 0.2mm on Amazon - is that small enough? Or do they come smaller?

Voyager1

Well-Known Member
TRF Supporter
Stupid question #1: What's the data cable for?
You will need the 3-wire cable for (re)programming the Tx module frequency via the LCD module (if necessary). See P34 of the assembly manual.

The 0.2 mm conical tip is small enough. In fact, 0.4 mm is probably small enough. You should have a range of tip sizes from 0.4 - 1.5 mm, depending on the SMD component lead/pad size.

Last edited:

cerving

Owner, Eggtimer Rocketry
TRF Supporter
You will need the 3-wire cable for (re)programming the Tx module frequency via the LCD module (if necessary). See P34 of the assembly manual.

The 0.2 mm conical tip is small enough. In fact, 0.4 mm is probably small enough. You should have a range of tip sizes from 0.4 - 1.5 mm, depending on the SMD component lead/pad size.
Your transmitter should have come with a 3-pin cable, unless it's a TRS (which is programmed using the USB-Serial data cable, the same one that you use for updating firmware and testing).

A 0.8mm conical tip is a pretty good fit for most of our kits, you might want to go down to 0.6 or 0.7 depending on how much heat your soldering station can put out and your soldering technique. Personally, I think 0.4 is too small... but Voyager1 might be a lot better at it than I.

Eggtimer Cris

Splinter

Active Member
Another item that’s generally overlooked in this discussion about soldering is a fume extractor. For those people who might be a little sensitive to these fumes, asthmatics, etc, this might be a good addition to their station. Although lead-free solder is in common use these days, the flux can still produce some irritation. These extractors have charcoal filters that can be replaced periodically.
A cheap way out is to use a small fan and blow the fumes away from yourself.

Voyager1

Well-Known Member
TRF Supporter
I use the 0.2-0.4 mm tips for 0402 Cs and Rs, and very small pitch ICs. Yes, I agree that the 0.6-0.8 mm is a better choice for 0805 and the ICs in your kits Cris. (Doubt whether I'm better - I've just been doing it with SMDs for nearly 30 years.)

Last edited:

Voyager1

Well-Known Member
TRF Supporter
A cheap way out is to use a small fan and blow the fumes away from yourself.
With our Summer conditions at present (35-40 C) on this side of the pond, I have a very BIG fan blowing!

Greg Furtman

Well-Known Member
TRF Supporter
Stupid question #2: I've seen it suggested to use a small conical tip. But what's "small" in this case? The smallest I've found is 0.2mm on Amazon - is that small enough? Or do they come smaller?
Actually I've found a small chisel tip works best as it has more contact area so it heats the pad & component up faster. Maybe 1/16" wide.

Greg Furtman

Well-Known Member
TRF Supporter
With our Summer conditions at present (35-40 C) on this side of the pond, I have a very BIG fan blowing!
Ya, I read yesterday parts of Australia are getting 45C to 50C. That is hot!!! Good luck. Meanwhile it is -29C here.