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21
CNC / The Devil made me do it
« Last post by ddmckee54 on September 17, 2021, 04:03:42 PM »
This is the 3rd time I've tried to post this, if they ALL suddenly show up, I'm gonna have some 'splainin to do.

OK, a week or so ago I was minding my own business cleaning and rearranging my shop to make room for a new CNC that I've been working on - slowly.  I've been working on the CNC router slowly, not cleaning the shop slowly - although that too is turning out to be a long drawn out process.  Anyway, I'd been at it a couple of hours when I found 3 of the 4 bench dogs that came with my Black and Decker Workmate when I bought it back in the Dark Ages - seems like it was that long ago anyway.  They look a lot like this. 

Well crap - only 3 out of 4, that makes them useless right, might as well pitch them right?  Then a little voice whispered in my ear that I've got a 3D printer, I can MAKE a replacement - good enough for me.  And away I go, out of the dusty amd messy shop into the less dusty and less messy livingroom - because that's where the 3D printer lives.  An hour or so later and I've got the 3D model for the bench dog complete.  Let's just say I'm not fast at this 3D stuff and leave it at that - OK?  An hour of so of printing later and I've got a shiny new replacement bench dog.  It looks a lot like this.


Here's a family shot of the B&D Bench Dog family and the adopted son, can you tell which one he is?


By now it's late afternoon.  HEY!!!  A man works that hard he deserves a little break - OK?  Anyway, about an hours worth of cleaning later... I found the missing B&D bench dog!  Here's the Bench Dog family and the Grey-headed step-child.


Half a day wasted, oh well - I sorta had fun anyway.  I told ya, the Devil made me do it.

Don
22
How do I?? / Re: Indexable insert holder, machining steps
« Last post by PekkaNF on September 17, 2021, 02:49:20 PM »
There are several methods that I have been reading, these I have considered

1: Mill the pocket and then locate the screw hole using the insert (you need a little offset to draw the insert into pocket or it will not be stable.

I made latest holder using mostly these instructions:


2: Or you could use some CAD/CNC to locake the features, bit like this:


Pekka

23
How do I?? / Re: Indexable insert holder, machining steps
« Last post by Mike K on September 17, 2021, 07:36:33 AM »
Okay, thanks.  I was just curious.
24
How do I?? / Re: Indexable insert holder, machining steps
« Last post by Muzzerboy on September 17, 2021, 06:52:20 AM »
There are various ways you could do this but I guess it made sense to the operator.

Drilling after milling might reduce stresses on the milling cutter it might otherwise see as it transitioned over the drilled hole. But as the spot drill hole would have been milled away, it's not obvious what purpose it (spot drill operation) served in the first place.
25
How do I?? / Re: Indexable insert holder, machining steps
« Last post by chipenter on September 17, 2021, 02:59:52 AM »
I think he set zero at the centre of the pocket , I have made holders and always drilled the hole last with the insert in place just to be certain .
26
How do I?? / Indexable insert holder, machining steps
« Last post by Mike K on September 16, 2021, 06:05:35 PM »
I saw this in an issue of Machinist's Workshop (Apr/May 2011) and was confused about the steps the author took.  It's a pretty standard indexable insert holder.  The work is a square bar with a pocket machined into a corner and a threaded hole to mount the insert.  The screw hole is 6-32 and is on center with the end mill (3/8") path.

The author's steps:
1. Locate screw hole.
2. Center drill about 0.1" deep.
3. Mill the pocket.
4. Return to the hole; drill through and tap.

I'm not as experienced as most and don't understand why the hole wasn't finished first before milling the pocket.  It seems like the author added an unnecessary step by having to return to finish the hole?

27
General Crafts / Re: Anyone for a Standard Surveying Thread?
« Last post by Henning on September 16, 2021, 04:19:14 AM »
I recently made an adapter for a self leveling rotating laser and when measuring the thread it looked to me like it was 5/8-11 UNC. My laser definitely had 60 degree threads.
28
Radio Control Models / Re: Bruder Manitou 2150 - RC conversion
« Last post by ddmckee54 on September 15, 2021, 04:35:13 PM »
OK, no pictures but I do have an update.

I found several examples on the Worldy-Wide-Web illustrating how to make an Arduino level using a 6050 IMU sensor, or at least how to get the pitch and roll angles.  Most of the examples are aimed at making autonomous quad-copters using an Arduino so they need to worry about high-speed responses, dealing with propellor vibration, and gyro drift.  None of those are going to be a worry for me since this is a crane with it's feet planted firmly on the ground - figuritively speaking.  ALL movements will be SLOW and at a known rate so the gyro isn't really needed.  There will be some vibration as the leveling feet are being lowered, but since I'm only dealing with one foot at a time that should be minimal.  The gyro was used to help deal with the vibration effects on the 6050.

With the pitch and roll angles it's a short step to auto-leveling a crane.  Last night I started out-lining how to have an Arduino auto-level a crane on command.  I also ordered a bunch of parts so that I could get the system working on a breadboard.

Now I've got to find the red, grey, and black filaments and print up a bunch of parts to build a mock-up.  Then machine some parts to turn the gearboxes into linear actuators, and test all that crap.  Then rinse, lather and repeat, if/when those parts fail.  Gotta be able to test this and get all the bugs worked out before installation.

Don
29
General Crafts / Re: Anyone for a Standard Surveying Thread?
« Last post by Spurry on September 15, 2021, 12:48:08 PM »
There is a Standard for the thread set out in:   https://www.iso.org/obp/ui/#iso:std:iso:12858:-2:ed-1:v1:en

So it seems BSW lives on, but UNC will also fit.  :thumbup:
30
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on September 13, 2021, 09:41:52 AM »
The new breadboard with screwed terminals arrived today. Very confusing when you buy from eBay and an item is delivered by Amazon in Amazon packing !

I must say that I'm impressed by the build quality and it looks like it will meet my needs. I'm now waiting for a delivery from RS of '0.7 mm Boot Lace Ferrules' that will plug into the existing female push fit sockets AND go in the screw terminals (keeping my options open). I do have 1 mm boot lace ferrules but although they fit the screw terminals they are no good for the push fit ones./

. . . . getting there slowly - one tiny step at a time  :thumbup:
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