Sherline CNC Gear Cutting Part5

[Ethensyardsale]

What a GREAT vid Thank you for making vids like this!

[AdeV2]

OK, ignore the 2nd half of my last comment, the video has now loaded.

Again, I'd like to say a heartfelt "THANKS!" from over here in Britain. As soon as my lathe arrives (end of this week....) I'll be looking to start some gears. Just for the heck of it!

[Hobbynut]

Your are surely welcome and thanks for supporting and sharing in the hobby world

[AdeV2]

This is a great series (as is your "How to make a gear hob" series); perfect for people like me who do machining purely as a hobby. I can't justify spending £100 ($160) on cutting wheels just to make a couple of gears every now & then, so your videos offer a really welcome alternative. Thank you!

Now.... when I try to play this video (THE most important one!) I get an error! Any chance you can re-instate it or re-upload it?

[aadengler]

Thanks Hobbynut. I appreciate your sharing this.

[Ibringthetruth1]

good vids!

other gear cutting hobbs always has the gear moving though.

excellent work

[hendeylathe]

Hobbynut, I,ve been a die maker for 30 years. I've run lathes, vert. & horzi. mills,shapers,vert. slotters.t&c grinders,surface grinders,EDM machines. And a Barber Coleman Gear Hobber! I've forgot more than you'll ever know or what you think you know.

[Hobbynut]

What a Waste! All that knowledge and experience and all you can do is attack others who are trying to share.

Welcome to the armchair warrior club.

[hobbyguy]

Hm, I dont see any contribution from all them 30 years of experience !!! hahaha... what a joker this Hendeylathe person.

Mr Hobbynut, you're my kinda guy! Thx for sharing what others most certainly refuse!

Marcel

[Hobbynut]

Thanks Marcel, If he had watched all the videos then he would  not have said what he did. anyway thanks for the support

[hendeylathe]

Shoulda just called Boston Gear.

[Hobbynut]

No Sir! You should have called boston gear. You seem to lack the skill to produce gears on your own so bashing someone that is trying to help others is your best way to feel better about yourself. Normally I would delete this comment but I think others need to see How silly you are.

[AlessandroAUS]

Why is wobbling around everywhere at the end? Isn't that bad? I also noticed the Hob didn't look perfectly true when spinning either, but that could have be the camera.

[Hobbynut]

I think what you are seeing is poor video skills in process. I apologize for the lack of video skills that I have. I can assure you that most things are running relativly true here. The hob may have a couple thousand run out due to the hardening process but this has no effect on the final gear.

[fgleich]

You mentioned something about the showing the gcode, but never did. Also, you didn't show how you made the keyway in the gear. How was that done ?

Thanks !

[Hobbynut]

In the #6 video I showed the Gearcodit program that produced the Gcode. The gcode changes for every different gear you make. Showing the specific Gcode for this gear would no accomplish anything. If you want to see the Gcode, Please download the software. Its Free!

[Dedadz1]

Great job HN! Very informative - I'm going to try my hand at this tomorrow. One question: did you harden the hob cutter after shaping it and if so, what is your technique? Thanks and I look forward to your presentation on the worm gears.

[YTerer4174]

Thanks for posting the video.

I have made gears with a rack tooth fly cutter.

You need to change your CNC program for the hob. Your way will not create an involute. You need to finish with full depth passes, then rotate the gear in 1 to 3 degree steps depending on how close you want the involute, And move the Z axis by the angel/360 times the pitch circle radius.

Moving the Z axis and turning the gear forms the involute. Your 20 tooth gear requires minimum 6 passes with 3 degree steps.

[Hobbynut]

Using a Rack shaped single tooth cutter you will not achive the proper shape for the tooth. The stacked cutter helps to approximate the shape better because the cutter above and below help to shape the tooth. Your Idea of moving a single cutter up and down by a few degrees will help to make a better involute curve but I use a spiral hob with much less work involved.

[CHHLIMA]

Thank you for spending your time making useful videos like this. I am sure a lot of people including myself appreciate that !!

[Hobbynut]

Your welcome. Stay tuned as I am trying to work out all the details on making worms/worm wheels. I hope to start this video series soon.

[John37Seymour]

Excellent job of presenting your how to make a hob and am looking forward to how to maka worms and don't let the nay sayers bother you and congratulations on a excellent presentation and thanks John.

[Hobbynut]

Thanks,

 I am working out the math and the method for teaching the procedure right now. I am not sure when but hope to star t this soon.

[tryally]

Congratulations! Their videos are excellent!

Luiz

[Gain1212]

Brilliant videos, if I had any reccomendations I would suggest a video on broaching if possible, when I get the money together i'll set up a workshop like that, out of curiosity what is your profession?

Full machinist? fitter?

[Hobbynut]

somehow I missed this comment for some time now. I am a machinist now as I worked my way into the machine shop at work.

[Thopter]

Uh....actual hobbing does not work like this.

You are using a hobber like an single cut involute gear cutter and this will not produce a correct gear!

The hobber teeth are actually arranged like a worm gear and so the hobber AND the gear blank are suppose to spin as the gear is cut. The hobber has to spin at a precise ratio to the blank, just like a worm gear, in this case it would need to spin 20:1 to make a 20 tooth gear. You have some serious runout issues too on your gear arbor.

[Hobbynut]

Ok Now actualy listen to the videos, all of them and you will realize that this subject is covered in detail and you have just shown that you you did not pay attention in the first place. If you do not like the way that I cut gears then I would recommend you not use this process. I have sucessfully used this process to cut many gears for my project and find it preferable on my budget.

[Hobbynut]

I am sorry thopter I should not have been so harsh in my response. I explained in the videos that this is not necessarily the proper way to do this and it is a procedure for the hobby machinist to produce gears for projects on a small scale and posssibly a way to save a little money over buying a gear hobbing machine or even comercial cutters. It is a poor mans way to make gears. Since the cutter resembles a gear hob It was easy to call it a hob.

[whatsupdealer]

How did you know that your gear was going to have 20 teeth

[Hobbynut]

I planned at the start to make a 20 tooth gear.

[whatsupdealer]

how did you turn the lathe exactly 18 degrees each time

[Hobbynut]

I used the lathe turn turn the blank then used the rotary table on the mill to cut the teeth, The rotary table is turned X degress depending on the number of teeth you have to cut.

[arabiccola]

Is this the Sherline 2000 mill where the milling stand can be put into an angle? then where did the A axis come from (the rotating axis that you turn 18 degrees at a time)? In the website it says that the 2000 CNC mill has three CNC-controlled axes and consequently three stepper motors only. In my case I need both the ability to put the milling stand in complicated (though fixed) angles and the ability to control the horizontal rotation (A axis) of the workpiece in degrees, just like you do here

[mijares58]

Congratulations!!!! From Venezuela. Your videos are great and useful!!

[DanFrederiksen]

that might seem too short compared to the time you put in it but I hope you can see the worth in being able to explain the whole process to the viewer in the time it takes to slap them in the face. the idea being to empower the viewer at maximum efficiency. tv quality and speed or even better. what do you think?

[Hobbynut]

Hmmm,, I understand what you are saying but the problem that I have found is that the experiance level is all the way from having never used a lathe and mill to experts in gear cutting. I had many emails asking question on cutting gears and as a result I made these videos, to include all the things that were asked,  These videos are aimed mostly at newbies that are just getting started and I find the more info I include the less email questions I get as a response.

thanks for the input.

[DanFrederiksen]

sounds very reasonable. it's teaching theory. if one wanted to intellectualize the process one might try a tree structure. one brief video like the one I suggested having 'dependencies' or prerequisite videos. layers that build on layers of knowledge. in this case, a general lathing video as the basis for a more advanced gear cutting video. but I understand it can become volumous work.

[Hobbynut]

Yes, It can be a lot of work. I have not had a chance to finish the hob making videos. I understand your concepts it is just to much work for me to make all those videos. Sorry Maybe I am just a little lazy or I have to many other irons in the fire at this time. Thanks for the comments. shorty

[DanFrederiksen]

up to you but it wouldn't actually be more video making. just modular.

and maybe even much less video

[DanFrederiksen]

great videos. if I may suggest a way to make it even better it would be to speed it up. to skip certain parts that are mostly trivial. this part 5 video is where it really starts happening and I think it's possible to make a video that starts here, just quickly showing the blank, stating that it's done by lathing stock bar, showing the centering trick, putting it on and then running the actual cutting, maybe as fast forward. then end with 'here it is' showing the final gear. a total of maybe 30s

[HalfCockedMD]

Does anyone have any videos showing how to grind lathe tool bits? I just bought some HSS blanks, and my first attempt was pretty sad.

[vider1973]

Excelent explanation, thank's very much for share you time and knowlogment to everybody!

Regards,

Rey

[HarryJ3720]

Shorty has a natural ability to communicate information of this type. I happen to see this, number 5 of 7, video first. I was so impressed I had to start back at the beginning and view all 7 of them. I am looking forward to seeing a video on how to make the hobb that Shorty spoke of making. Sherline needs to sponsor this guy.