Quick Update
Added 2016-09-30 04:21:24 +0000 UTCHey folks,
A quick update for you, so that you know where I'm at with the next Patron Series and YouTube projects.
I've spent the last 2 weeks continuing with the prototype work for each project, and all is going well so far. As it happens there are a quite a few square holes to be formed for these projects, so I needed to make 2 new square broaches for the job, and I've included a couple of interesting improvements to the broach design.
The first (suggested by viewer "pdgeman"), was to turn a circular section on the shank of the broach, so that it simply falls out upon completing the stroke. Its such an excellent idea, and the broach does indeed drop out removing the need to lightly punch it out with a piece of rod. A lot more elegant, and a nice time saver.
The other improvement was to change the method of how I distribute the chip load across the teeth. It's definitely worth reducing the chip load for the entry teeth and re-distributing it towards the later teeth, but in these most recent broaches I made it a little more pronounced. Essentially I have tried to balance chip volume and cutting length across the length of the stroke. If you look at the associated drawings for this post you can see the entry teeth are taking a very light cut across a long cut length, and then the DOC per tooth progressively increases (at an increasing rate) as the cut length reduces. The last few teeth take the heaviest cuts over a short cutting length.
Its an idea that I've not yet fully refined, and it could do with a bit of a mathematical treatment, but even this "eyeball" change to the design has resulted in a much more pleasant broach push through. It produces roughly the same chip volume within each groove after the cut, and I can feel that there is much less risk of it either jamming or breaking during the push.
I've also spent a lot of time making all of the additional tools and equipment required to get these next 2 projects rolling, mainly surrounding the set up of a home foundry to cast a lot of the required stock and parts. I will share the details on this with you over the coming weeks and months as these new projects roll out, but for now I'll continue with the prototyping and foundry setup work this weekend, and from the following weekend, I'll be back into the clock build with a new video on the stop work mechanism planned for release in approximately 3 weeks.
Cheers,
Chris.
Comments
Just wanted to say I wish I had become a patreon supporter sooner, didn't realise how much extra content was here. Many thanks.
Ethan
2016-10-23 10:04:27 +0000 UTCRight here! Post plenty of pics :)
Clickspring
2016-10-01 03:32:33 +0000 UTCIt's funny but I read your post with your accent vary cool looking forward to it.........cheers
kevin todd
2016-10-01 00:59:03 +0000 UTCHey Mitchell I purchased mine from Enco: <a href="http://www.use-enco.com/CGI/INPDFF?PMPAGE=490&PARTPG=INLMK3&PMITEM=282-3115" rel="nofollow noopener" target="_blank">http://www.use-enco.com/CGI/INPDFF?PMPAGE=490&PARTPG=INLMK3&PMITEM=282-3115</a> An AXA size wedge style. Its a little bit tall for my SC4 lathe (ie center height is a bit lower than what the tool will come down to when installed) so I had to reduce the size of the tool holders by about 5mm, but other than that its a great fit. For the green 9x20, no issues at all, a straight bolt on and go. Cheers mate :)
Clickspring
2016-10-01 00:39:45 +0000 UTCYes love his videos!!
Clickspring
2016-09-30 19:17:28 +0000 UTCwrong button, the foundry sounds great, just need to keep in mind how big and what material? Looking frward to it, I have a furnace and over the years made many thing I would not have gotten. Best of all your mind is the starting place to make dreams become reality. Good Luck and happy building
Nelson Collar
2016-09-30 17:06:47 +0000 UTCChriss
Nelson Collar
2016-09-30 17:02:04 +0000 UTCOh this should be interesting! Thanks for including the updates on your broach design as well!
Mike Michelizzi
2016-09-30 11:36:05 +0000 UTCHI Chris - The foundry sounds like fun. I'm sure you're already familiar with the foundry videos of "myfordboy" on youtube. <a href="https://www.youtube.com/watch?v=IYZOTt9zTv0" rel="nofollow noopener" target="_blank">https://www.youtube.com/watch?v=IYZOTt9zTv0</a>
Ken Potts
2016-09-30 10:31:58 +0000 UTCI'd forgotten about the video on making the broach. Thanks!
Al McKague
2016-09-30 09:19:28 +0000 UTCHey Al, no taper on the raw stock, essentially still the same process as here: <a href="https://youtu.be/MYI1slVGziU" rel="nofollow noopener" target="_blank">https://youtu.be/MYI1slVGziU</a> except for the new additions. Cheers mate :)
Clickspring
2016-09-30 09:09:19 +0000 UTCThe new broach design is very interesting. Do you cut a taper to start or is each step turned as a circle? I guess if you turn a taper, the steps with no flats might jam. Very nice! The foundry idea sounds great!
Al McKague
2016-09-30 09:04:27 +0000 UTCoh yeah! Your takein the foundry/casting looks like a dream :) keep the great work going!!
Pedro González
2016-09-30 08:42:01 +0000 UTCI kinda don't want to blow the surprise, but both projects are shaping up well at this stage...
Clickspring
2016-09-30 05:00:25 +0000 UTCFoundry! Exciting (and slightly unexpected) branch out of work. Can't wait to see how you take the precise, beautiful care of your machining work into casting, Chris. Highly interested!
Dan and Wendy and Ellie
2016-09-30 04:51:43 +0000 UTCOh My. Home foundry. Def looking forward to this new series.
Matthew Dormer
2016-09-30 04:48:04 +0000 UTCHome foundry?! Oh man. Can you give any hints or clues what the next project is about?
2016-09-30 04:42:15 +0000 UTCSounds great! Looking forward to the news
Pretenda
2016-09-30 04:26:29 +0000 UTC
