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Project Logs / Re: Board track racer
« Last post by OKTomT on December 11, 2017, 08:59:19 PM »
Osselton yes the hub is threaded.

The flashbackfab bikes are a very good example of a board track racer and thanks for posting the link but that is not what you are going to see in this post what I am building will have some similarities to a board track racer but is not a replica of a original. I enjoy building engines and the bike is basically a display stand for my engine all though it should be rideable it will be ridden very little
Here is a picture of the rear hub and sprocket blank
Tools / Re: High speed drill attachment for lathe
« Last post by Doc on December 11, 2017, 05:13:53 PM »
2nd installment in high speed drill attachment for the lathe. Cutting holding cup, drill  and boring tail stock Morris taper blank. Just waiting fr drill chuck to arrive.

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I guess you could work it out from this 2102  data sheet -

with all inputs at 5V  it gives the supply current as 45mA

the current will increase when your reading and writing to it

as the Power Dissipation as 1W it
looks like the current could  increase  to 200mA during the R/W cycle


I knew, just knew, I must have the Newbear literature SOMEWHERE!!!

This afternoon, I searched through the filing cabinet and found it!!   :thumbup:   :thumbup:   :thumbup:  Halfway back in only the second drawer!

The search took quite a while but that was because I kept reading all the interesting long-forgotten stuff I wasn't looking for.   :ddb:   :ddb:   :ddb:

The schematic diagrams are on diazo dye-line print paper and have aged a bit but are still legible.  Maybe I'll have a go at re-drawing them in Fusion 360.

I got a 120 day warning when I started this reply but I thought I'd post anyway in case anyone else needs the data for these Newbear RAM boards.  Do you think a Google search for 'Newbear' would find this post?

Who knows how many milliamps 4 KB of 21L02 static RAM plus address logic would draw?   :lol:   :lol:   :lol:   :lol:   :lol: :lol:
Project Logs / Re: Board track racer
« Last post by RotarySMP on December 11, 2017, 08:38:46 AM »
Harder to explain than the concept is... Oval track, built from boards (wood, aka "brown stuff"). Follow the link;
This is one heck of a build!


Wow, that link cost me most of saturday evening and sunday morning. Superb.
How do I?? / Re: Shardlow Mini internal mic
« Last post by awemawson on December 11, 2017, 04:59:00 AM »
Know anyone locally with a Shadowgraph who could measure them for you?

I'd offer the use of mine but I think that you're in the Antipodes so a bit of a long trip to Blighty?
How do I?? / Re: Shardlow Mini internal mic
« Last post by Mike4 on December 11, 2017, 03:33:58 AM »
I assume that these small threads would be BA ,but I dont have the screws so this might sit and collect dust for a while.

CNC / Re: DDCSV1.1 4 Axis controller
« Last post by chriscnc on December 10, 2017, 08:18:39 PM »
@Will D

The new code was made just for this, I have different steps per mm and all 3 axes. so with the new code, you must turn on software interpolation line #113 if i rember and set the res to .001  If your axis are the same then you can leave #113 off but there is still some CV benefits.

CNC / Re: DDCSV1.1 4 Axis controller
« Last post by chriscnc on December 10, 2017, 08:14:34 PM »

It will still helix, you just tell the post processor to not use the helix command and it will still make a code that does a helix. This controller mirrors a fanuc O-M witch still is used today. even new ones have to be enabled to do this. its just the way the code is feed, It does helix just not with a helix line.  when you make a Cam process that has a helix plunge its just saying you want to spiral the tool in. when you post process based on your post processors setting will make code that fits your controller. so it will still do the helix just not with a G03 Z line. If that makes sences. so there is nothing this control motion wise it cant do vs say mach3 etc. you just need to feed it the right post processor.
How do I?? / Shardlow Mini internal mic
« Last post by Mike4 on December 10, 2017, 05:48:22 PM »
I recently bought one of these well made internal mics, however earlier in its life some gorilla has broken the thread off the handle and over tightened the retainer screw.

I have managed to grind the end off the retainer screw and get it out , however I have no means of determining the original threads used one either of these as one is missing and the other is too badly mutiliated to measure with any certainty.

Does anyone have a lead to the pitch of these threads as I would like to restore this instrument and use it in the shop.

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