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Caleb Mayfield
เข้าร่วมเมื่อ 18 ก.ย. 2013
This channel covers the vast array of hobbies I enjoy, or one hobby depending on how look at it. From machining, welding, and blacksmithing to computer, micro controllers, and electronics and even the great outdoors with hunting and fishing, I do it all.
DIY Block and Tackle
I could not find the tool I was looking for, so I made it. This is a quick overview of a 3 sheave Block and Tackle with swappable hooks on each end.
มุมมอง: 14 420
วีดีโอ
Mini Mill CNC Conversion: Part 7 Operational update 1
มุมมอง 1.2K7 ปีที่แล้ว
Quick update on what's been going on with the project. Also; www.mockingbirdhillforge.com mockingbirdhillforge
Mini Mill CNC Conversion: Part 6.2ish GRBL Controller
มุมมอง 1.4K8 ปีที่แล้ว
Progress update on the mill conversion. How does grbl work on the Arduino, how do you connect it, and way covers/chip shields.
Mini MIll CNC Conversion: Part 6ish Update and Mail Call
มุมมอง 9178 ปีที่แล้ว
Quick update on where I'm at with the CNC conversion. I've decided on locations for the switches and mounted what I have already on the case. Parts in a box from Amazon. Upcoming parts of the project overview.
Mini Mill CNC Conversion: Part 5 Milling the Motor Connector Plate
มุมมอง 1.6K8 ปีที่แล้ว
All systems go for test run. Will it mill?
Mini Mill CNC Conversion: Part 4 Problems with the X
มุมมอง 2K8 ปีที่แล้ว
In this installment I have a brief update on the control box and then dig into why the x axis is having problems.
Mini Mill CNC Conversion: Part 3 Ballscrew install recap
มุมมอง 4.4K8 ปีที่แล้ว
This video recaps my experience installing the CNC Fusion Kit #5 and some things to keep in mind when doing yours.
Mini Mill CNC Conversion: Part 2 Touchscreen Frame Construction
มุมมอง 1.9K8 ปีที่แล้ว
First, I apologize for my voice, allergies, and secondly for the low quality. This is a test of a different recording method than my phone and I'm going to keep trying different ones till I get a good one. This video is just a brief overview on how I am making a frame to mount my 7" touch screen for my CNC conversion. I haven't seen anything like this so far, so I'll keep trying to document as ...
Mini Mill CNC Conversion: Part 1 Intro
มุมมอง 6K8 ปีที่แล้ว
Overview of the parts I will be using to convert a manual Little Machine Shop 3990 High-Torque Mini Mill from manual to CNC. Ball Screw Kit: www.cncfusion.com/minimill1.html
Homemade fly cutter test cut
มุมมอง 7279 ปีที่แล้ว
1.375" 4140 round stock turned to 0.625" on the shaft. The head is 1.300", milled off to about 12° and the set screws are #8-32. The tool slot is 0.260" wide and deep.
This might be a little late but you’re like one of my favorite human beings at the moment of that video
Can you create a parts list and post it to your description please?
How much all of that cost?
I'm so glad you put this vid up. I've been looking around for months for a similar 3 sheave block and tackle and there's very little out there to match it. Thought about doing this like you have, so now I know the concept will work. Great ! The pulleys that are available seem to be customised for particular applications, i.e either for climbing, arborists, gym equipment, awnings, boating, rescue, pulling 4X4's, crane pulleys or general heavy duty blocks that cost a fortune. I also looked at chain blocks, lever chain pulley, ratchet winches / brake winches but none offer the speed and versatility, compactness, low cost and strength as your setup. Also this 3 sheave has the advantage of being able pull or lift an object.
The Achilles heel is the bolt.
Confusing summation:' ..price wise this is new, and it's gonna work'. Your fabrication may be acceptable to accomplish your task but on what basis do you equate it to a block and tackle?
3 pairs with 1 pair loading each pulley. Not 6 lines. Divide or multiply by 3 not 6👍 Divide by 6 for the rope capacity.
Check out AMAZON!! I bought one for 37 dollars… only a few left! Better hurry!
Is there a mechanical reason for putting all three pulleys on the same sheave bolt? Do they not work as well if they are only fixed at the anchoring end?
I just got my new LMS 3990 and am planning a CNC conversion, also. Were you able reduce the backlash by installing larger balls in the ball nuts? Your videos are really helping me to get ready for the project. Thank you.
Glad it helps! Hopefully one of these days I'll be able to get the rest of the videos uploaded. Yes, using "oversize" balls in the ballnut, and deburring and tuning the gibs, I was able to get the backlash on X and Y to 0.002" - 0.003". I had Z at less than 0.006, and then moved across the country and tore apart the Z axis to do the spindle bearing upgrade and convert the pulleys to the High RPM set. I have not been able to do much with it since then. I'm planning to get back to it and run a few projects this year.
@@CalebMayfieldMHF Thanks for the reply. You say you were able to get the backlash on X and Y to 0.002" - 0.003". Is that in 12" or was that for the total travel?
The backlash is on direction change. The amount of distance the table should move before it actually starts to move when changing the direction of ballscrew rotation. The precision over distance is more a factor of calibrating your stepper motor to the rotation of the ballscrew. That is dialed in pretty much dead on. If I punch in move 1.000" it will go 1.000", but if I then say go back to 0.000 it will end up at 0.002-0.003 due to the backlash.
@@CalebMayfieldMHF Got it - thanks.
Absolutely brilliant, sir! Thank you so much for sharing!!
Fantastic project! I believe you're incorrect on the pulley weight. You should stick with the load limit of each pulley no higher. Think about it this way, a 400 pound load, four ropes, you pull 100 lb the next rope gets 200 the next rope gets 300, that last rope is still pulling the full 400 lb, it's not divided by 4. You can't go over the manufacturer specs on the pulley.
How much does something like this cost to convert?
Right now I'm honestly not sure. The ball screw conversion kit I used was no longer available last I checked, and that was the biggest single cost. Depending on how you go about it, I'd say if you go new parts you are going to spend at least as much converting as you did on the machine. So $1200-$1500 on a LMS 3990 sized machine. That being said, at $3k-$4k in you are competing with a Tormach 440 on capabilities, but you build it yourself instead of unboxing, setup and go.
Wow -a really great device, and the video itself was well done too! Let's see that bad boy in action! If it worked as expected or not, it would be great to see a follow up. That is - if you can just drop everything else you're busy with and spend another 8 hours making another video...
Love the video what did you end up doing for the becket? Got a video of them in action?
Where did you get the pulleys and what weight are they rated for?
I got them at a Farm Supply store at the time, but they are available on Amazon. Each pulley is rated at 480 lbs. www.amazon.com/National-Hardware-N195-800-3213BC-Single/dp/B000BD8N0U/
it is a great idea.. many thx..:)
I am having the same problem, but my x2 x axis has been running fine for 3 years and this just started. There's a slight grinding and my parts are being damaged during machining. I've took it off as you have and tried to align everything, but I keep getting the x axis machining errors. I have not looked at my bearings, maybe they need to be replaced? I have a slotted nut on the end of the ball screw that I cannot get off. Any suggestions?
Difficult to say without seeing it. I haven't been able to do anything on my mill for a couple years now due to a move and career change. I'm hoping to get it back up and running again this summer and post the rest of my videos.
@@CalebMayfieldMHF I figured out exactly how to fix the problem and the cause of the problem. It's the wear of the GIB itself which creates the problem. Over time the GIB wears down on one side, the right side of mine was the issue. So when you put the axis back together and tighten the gib screws when it's in the middle position, what you need to do is run your x axis by cnc control all the way to the left and all the way to the right. I started getting the crunching sound when I was near about 3/4s to the right. So to remedy the problem, you loosen up the very right gib screw so it allows the GIB to not catch up on the grinding of the gib to the x axis table channel. Then you slightly tighten the gib nut to secure the position. Next time I take it apart for any reason, I will make a video.
What did you determine on the size of the ball bearings for those ball screws? I can’t find any info online regarding the maximum size that will work. Thanks for any insight.
Caleb Mayfield....any chance you can provide some links to all the parts that you use..?? I am looking seriously at doing this in the new year, and am trying to compile parts and supplier list. I am especially interested in the supplier with the ball screws and plates. By the way.....awesome and very well structured presentation...!! Thank you !!
I am about to do the conversion to my LMS 3960 and I do have the airspring installed. Was there any issues with the airspring? Before I jump into this project do you have any words of advice?
I am planning to do a conversion soon and your videos are very helpful.
Your videos on the CNC conversion have been very helpful in deciding which mill and control system to use for my own project. How has the BCNC control system been working for you? Likes, dislikes? I see it used a lot on PCB mills but not these types of mills. How is probing and edge finding working for you? Would love to see a video about the day to day workings of BCNC as it relates to metalworking, power draw bars, auto tool chargers etc. if you've gotten that far with you build.
Greg Sherwin BCNC has been really nice, but honestly way more than I can use at the moment. Had some life changes happen and the mill is actually shrink wrapped at the moment and will be for a few more months. I'm hoping to get it running again by the end of summer. All in all its going to be a great interface.
What made you choose the machine from little machine shop over the grizzly or harbor freight mini mills?
Anthony Webb it's been a while since I bought it, but I believe the biggest factor was the column. The LMS ones are supposed to be heavier and more rigid. The were also located near where I lived at the time and was able to drive over and pick it up. No shipping involved.
Great video. I'm hoping to buy the same mill this year, learn on it manually and eventually convert to CNC. Your table removal tip will definitely be put to use. Little Machine Shop's CNC conversion instructions state "limit switches are not necessary" but don't elaborate at all. Have you found a need for them?
snyder275 I believe the limit switches are more dependant on what you are using to control the machine with and whether or not you have homing switches. I plan to do both. I've used it successfully without either, but I've also crashed it and broken a number of end mills because it didn't do a homing cycle.
Out of curiosity as I'm still trying to figure all this out, why didn't you use a GRBL Shield instead of having a shield made? Is it to support other options not offered on the GRBL Shield?
Konish P. I couldn't find a shield I liked that had the options I wanted, pin layout, and access to the options. The shield I designed has the pins layer out by wiring without having to jump across others and trying to squeeze a bunch of ground wires in on one spot.
Thanks for the quick reply. I going to start a CNC conversion on the exact mini mill, and really like the thought of using an Arduino UNO, gshield, and bCNC on a Raspberry Pi 3 like your set-up.
Hi Calab, First I would like to thank you for sharing your build and knowledge! :-) When it comes to GRBL, have you found a way to do software backlash compensation? Keep up the good work!
I have not yet. I've actually had to put the project on hold due to job and health issues. I started researching it, but haven't found a solution yet.
Caleb Mayfield Health and family first! :-) Keep up the good work, and hope you feel better soon!
awesome series, might borrow some of your designs. you deserve a ton more views
Thanks! I've had some health problems recently, should be getting a few more videos up soon on recent progress.