[time-nuts] TruePosition GPS Receiver firmware

I got in a TL866A programmer with the complete adapter set, pulled the flash chip from my dead TruePosition, and dumped the chip. Success first time! Now to go through the ROM dump and see what hidden goodies there are. A quick look seems to show commands for setting Kalman filter

[time-nuts] Machining some aluminum help!

Hi, I have a square aluminum tube 5" X 5" with a .25" wall it's 8 1/2" long. I need 20 holes in each end tapped for 4/40 and 1/2" deep. This is for a Rubidium project. The local machine shop want's $360.00 Anyone have a machining setup that could do the work a bit cheaper? If not I'll

Re: [time-nuts] Machining some aluminum help!

This is fairly easy to do on a vertical mill, but it can be done using a drill press. I would machine and drill the end plates first. Then I would use hot-glue or double-sided tape to attach one of the end plates to the tube ends and use the end plate as a drilling guide to drill and tap the

Re: [time-nuts] Machining some aluminum help!

Price sounds reasonable to me. Tapping 40 each 4-40's that deep in to a closed hole is the killer. If I still had my old Bridgeport J and was NC'ed Your looking at say 1 hour to program, 10 minutes to mount in a vice and get aligned, drill 40 each #44 or #43 holes would be easy, but then slow

Re: [time-nuts] Machining some aluminum help!

On 5/18/17 9:54 AM, cdel...@juno.com wrote: Hi, I have a square aluminum tube 5" X 5" with a .25" wall it's 8 1/2" long. I need 20 holes in each end tapped for 4/40 and 1/2" deep. So you're putting 5 holes in each side? in the ends? (i.e. the long axis of the screw is within the wall?

Re: [time-nuts] Machining some aluminum help!

Ask them what they'd do it for without the tapping. Normally I'd do something like this for free but 40 tapped 4-40 holes in heavy wall aluminum is a pain. It would be a miracle if I didn't break the tap off at least once. Last time was for a resonant cavity amp (23cm band) and I had to soak my

Re: [time-nuts] Machining some aluminum help!

Tap Magic for Aluminum will be your best friend for this operation. I've been using it on some extrusion for a 3D printer project. It makes an amazing amount of difference. Good luck with you project. Todd On 05/18/17 12:18, Pete Lancashire wrote: Price sounds reasonable to me. Tapping

Re: [time-nuts] Machining some aluminum help!

On 5/18/17 10:03 AM, Bob Darlington wrote: Ask them what they'd do it for without the tapping. Normally I'd do something like this for free but 40 tapped 4-40 holes in heavy wall aluminum is a pain. It would be a miracle if I didn't break the tap off at least once. Very much so.. 40 tapped

Re: [time-nuts] Machining some aluminum help!

I'm very dubious that you need a tapped 4-40 hole to be threaded any deeper than 0.25". If you work with the machinist I'm sure you can come up with some reasonable spec that does not require a bottoming tap and will save you a lot of money. I bet you went to 0.25" wall square tubing only because

Re: [time-nuts] Machining some aluminum help!

People's (mis)perception of machine shop costs always amazes me. All too often they equate the fact that they could do it themselves (inaccurately) on an old drill press and then hand tap with what a real shop will do - all while that real shop has a $100k - $500k investment in a single machine.

Re: [time-nuts] Machining some aluminum help!

On 5/18/17 11:53 AM, jimlux wrote: On 5/18/17 11:16 AM, Tim Shoppa wrote: I'm very dubious that you need a tapped 4-40 hole to be threaded any deeper than 0.25". If you work with the machinist I'm sure you can come up with some reasonable spec that does not require a bottoming tap and will save

Re: [time-nuts] TruePosition GPS Receiver firmware

Maybe I have a problem unit but I measured the supply to the antenna at 3.7 volts. I have a 5 volt antenna and it still receives sats at the lower voltage. Anyone else check this supply? I wonder if it is a settable parameter? Regards, Tom - Original Message - From:

Re: [time-nuts] Machining some aluminum help!

Or go for thicker wall aluminium tube, oversized endplates and long bolts or threaded rods running the entire length down the outside of the tube so you're clamping both ends in one operation. No tapping required. Simples! On 19/05/2017, at 6:16 AM, Tim Shoppa wrote: > I bet you went to

Re: [time-nuts] Machining some aluminum help!

Corby, Is it a 'pressure' seal or a 'vacuum' seal? Vacuum should be much easier to achieve. Joe -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of cdel...@juno.com Sent: Thursday, May 18, 2017 3:34 PM To: time-nuts@febo.com Subject: [time-nuts]

Re: [time-nuts] Machining some aluminum help!

Andy, Although this is a hydraulic cylinder, this is along the lines of what you described. On Thu, May 18, 2017 at 19:18 Andy ZL3AG via time-nuts wrote: > > > Or go for thicker wall aluminium tube, oversized endplates and long bolts > or threaded rods running the entire

Re: [time-nuts] Machining some aluminum help!

> On May 18, 2017, at 8:13 PM, jimlux wrote: > > On 5/18/17 2:36 PM, Chris Albertson wrote: >> It would be easy to re-design the job for cheaper machining.. Do you >> really need to tap the holes? You might use self taping screws. Id the >> would work then you can do

Re: [time-nuts] Machining some aluminum help!

Why are my eyes watering? On 19/05/2017, at 5:03 AM, Bob Darlington wrote: > I had > to soak my cavity ring in nitric acid for a month to get the tap out. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Machining some aluminum help!

So the goal is not to attach end plates, that is the solution. The real goal is a sealed container that can be re-opened.I suggest a trip to the plumbing supply store.Why not just use screw-on end caps It you need it sealed 4-40 screw are not able to provide any reasonable clamping force.

Re: [time-nuts] Machining some aluminum help!

On 5/18/17 2:36 PM, Chris Albertson wrote: It would be easy to re-design the job for cheaper machining.. Do you really need to tap the holes? You might use self taping screws. Id the would work then you can do the work yourself with just a hand drill. OK it you must use machine threads and

Re: [time-nuts] Machining some aluminum help!

Content by Scott Typos by Siri > On May 18, 2017, at 4:34 PM, wrote: > > Well that generated a lot of advice and thanks for it! > I think I might do it myself and go with a 1/2" hole depth and 1/4" > threaded depth. > I'll get some of that Aluminum Tap

Re: [time-nuts] Machining some aluminum help!

On 18/05/2017 4:34 PM, cdel...@juno.com wrote: I think I might do it myself and go with a 1/2" hole depth and 1/4" threaded depth. Or go back to the shop and get a new quote with them knowing it's not bottom tapping, only 1/4" threaded depth. Michael

Re: [time-nuts] Machining some aluminum help!

Yes, generally when something is expensive to manufacture it is because the designer was not thinking about costs. A design with 40 size "tiny" thread holes in just not cost-effective. A redesign could save hours work. On Thu, May 18, 2017 at 11:16 AM, Tim Shoppa wrote: >

Re: [time-nuts] Machining some aluminum help!

On 5/18/17 1:34 PM, cdel...@juno.com wrote: Well that generated a lot of advice and thanks for it! I think I might do it myself and go with a 1/2" hole depth and 1/4" threaded depth. I'll get some of that Aluminum Tap magic, some new taps and new drill bits. Good idea about drilling the end

Re: [time-nuts] Machining some aluminum help!

It would be easy to re-design the job for cheaper machining.. Do you really need to tap the holes? You might use self taping screws. Id the would work then you can do the work yourself with just a hand drill. OK it you must use machine threads and they must be #4 size try "rivets" these work

Re: [time-nuts] TruePosition GPS Receiver firmware

Cool. Should be interesting to see what you find. I've been hacking at the VxWorks side of things, off an on, but have been distracted by this #wannacry business among other things. That TL866 is certainly a good value, and it seems to work well. Looking forward to hearing what you turn up.

Re: [time-nuts] Machining some aluminum help!

I agree, tapping that depth in aluminum is just asking to gall the threads. If you have a decent alloy (6061 7075) you only need 1/8” to hold what ever is save to hold with a #4. If you need more strength then it would be best to use helicoil inserts. Where are you located? There are a number

[time-nuts] Machining some aluminum help!

Well that generated a lot of advice and thanks for it! I think I might do it myself and go with a 1/2" hole depth and 1/4" threaded depth. I'll get some of that Aluminum Tap magic, some new taps and new drill bits. Good idea about drilling the end plates first and drilling thru to match. Between

Re: [time-nuts] Machining some aluminum help!

If you need pressure moisture tightness you are going to want to have machinist mill tube ends and plates flat if you take off say 075-100 thousands deep and .225 thousanths around edge of plate and have machinist predrill holes in cover plate you will have both a tight seal and drill guide for

Re: [time-nuts] Machining some aluminum help!

These threads where there is not enough information to define the problem can grow forever, because they are based on speculation, not facts. Corby, you have decided what you need based on what you know, but the rest of us need a more general statement of the problem. Unless, of course, that is