Friend gun fool Timo

Friend gun fool Timo:



Friend gun fool Timo, and the rest of my Finish gun fool friends:


You Finish folks are thinkers and doers.


Concerning how to properly taper lap a rimfire barrel:


I've pondered just how to go about instructing the process I use.



Here's the conclusion I've come to:



No matter what I advise you about the materials and processes needed to properly taper lap a rimfire barrel, the one thing I can not give you is "experience".


Experience is something you have to develop, yourselves.


Therefore......................



When I have time I'm going to list the materials that I use......


Then..................


As you Finish gun fool friends begin your journey to acquire taper lapping "experience", if you have questions I'll do my best to answer them.


The list of materials I use, soon.


Your pistol fool friend, Bill Calfee

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This is where my heart lies................seeing that the masses have access to these amazing EFBR guns.

Hi Bill!

We have here in our country more or less "barrel polishers" and their opinions of barrel lapping.

I hate idea that we lost our time to wrong materials and wrong working methods.

With right materials we can look to mirror and try find issues from there and get more experiences.

I fully understand that in this case it is: "Your way or highway".

I put here few small things we have learned/seen :

*Warm up barrel muzzle near "lead tin" melting point or we get very bad laps.

*When feel tight spot in barrel dont use short push/pull. Easy to get loose spots both side of this tight spot.

But better to start of right materials!!!!

BR, Timo

Friend lapping fool Timo

Timo said:

Hi Bill!


*Warm up barrel muzzle near "lead tin" melting point or we get very bad laps.

*When feel tight spot in barrel dont use short push/pull. Easy to get loose spots both side of this tight spot.

But better to start of right materials!!!!

BR, Timo

Click to expand...

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Friend lapping fool Timo:


Lesson 1:


Keep it simple......


It looks like you have a good, ball bearing lapping handle that's easily removed......good.


It looks like you have a good, spring steel lapping rod.....good...


Turn you a jag on the end......1/2" long is plenty.... OD of jag about half the OD of the lapping rod.


Don't use a screw on jag..................


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You do not heat the barrel near the melting temp of the lead........you will solder the lap to the bore.....


The only way to remove it is to melt it out...


You do heat the end of the barrel before you pour a lap, yes......


The amount of heat determines the fullness of the lap.....along with the temp of the lead...


What are the correct temperatures?


You will learn......from experience.......there's no other way....


______________________



Now, do this:


Make you a simple lapping fixture, just like this picture....

(I can't imagine lapping on the table of a good milling machine.....you might as well pour sand all over that machine)






One V block and clamp for the barrel, and one V block and clamp for the lapping rod guide...


Keep this in mind:


When one jig laps, if the bore of the barrel and the lapping rod guide are not in perfect alignment, you'll ruin the bore of the barrel.....


The single V block, held by a single bolt to the lapping base, allows the barrel and lapping rod guide to be aligned laterally, since they swivel....


I shim the V blocks to align the barrel and guide vertically.....


This alignment must be perfect, not close, but perfect, or you'd be better off not jig lapping to start with...


But...........


When jig lapping is done correctly, it creates guns like TDX and Black Death and Rooster and Raging Inferno and all the other iconic RFBR Champions and World Record holders...



As soon as you make up a simple lapping base, like the one pictured, please photograph it and post it...OK....

Then we'll continue......


Your pistol fool friend, BC


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PS:


Friend lapping fool Timo.......


You said something about it being "my way or the highway", when it comes to this lapping thing...


That pretty much says it......


Friend Timo, I'm not an educated man....nor very intelligent....


What I do have, when it comes to taper lapping a rimfire bore, is this:


I doubt there's anything that you, or anyone else, can think of when it comes to taper lapping a rimfire bore, that I've not tried over the past 40 years.....


I've seen every pitfall imaginable with taper lapping a bore.....every single one of them.....and sometimes more than once...


Now, make up that simple lapping base and post a picture of it.....



BC

Hi Bill!

This milling machine table has been protected when lapping on it.

Got little "space problem" because few last years to this space Juha Söderholm has builded there gun drilling machine,button rifling bench also new CNC lathe and before there was "normal" gunsmith equipments.

Juha has over 20 years experience of building CF benchrest rifles, own actions etc.BR shooter himself also.Won our championships this year on I.R.50/50 Sporter.
Shooted smallest 200 m group in World Championships South Africa years ago.
Now he is intrested very much of RFBR "world" and also understood how different world this is compared to 6PPC world.

To me and us it has been very intresting to be part of it.Trying together to find solutions different things.Amongst there is how to control twist rate in button rifling process etc. Lot of head scratching.Step by step.


But we find place where to change lapping in his shop.Take photo and send it.

BR, Timo

Friend gun fool timo

Timo said:

Hi Bill!

But we find place where to change lapping in his shop.Take photo and send it.

BR, Timo

Click to expand...

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Friend jig lapping fool Timo:


Jig lapping is the ultimate way to properly taper lap a rimfire bore....


And jig lapping is the only way a post chamber lapping can be accomplished...


IF IT IS DONE CORRECTLY.


If jig lapping is not done correctly it will ruin the bore in a heartbeat...



The secret to jig lapping correctly, is in the alignment of the lapping rod guide to the bore of the barrel being lapped.


This simple arrangement will provide that perfect alignment.....





And it can be clamped to about any solid surface.....and then put away when not in use.....


So it doesn't take up any room in the shop.....



Your lapping fool teaching friend, BC

Hi Bill!

Lapping place changed. Picture of it. Enough stable to work with.

We are intrested materials you recommend to use and also your slugging method and measuring during process.

I dont know how small difference human hand can feel when lapping but with my small experiene think that smaller or as small you can measure..

We have high quality digital micrometers with 0,001 mm show but I have been looking in other business area very accuracy measuring in temperature calibrated room with temperature calibrated equipments and when I see this work I lost my self confidence to measure anything reliably with 0,001 mm accuracy-.

BR,

Your lapping fool Timo

Friend lapping fool Timo

Timo said:

Hi Bill!

Lapping place changed. Picture of it. Enough stable to work with.

We are intrested materials you recommend to use and also your slugging method and measuring during process.

I dont know how small difference human hand can feel when lapping but with my small experiene think that smaller or as small you can measure..

We have high quality digital micrometers with 0,001 mm show but I have been looking in other business area very accuracy measuring in temperature calibrated room with temperature calibrated equipments and when I see this work I lost my self confidence to measure anything reliably with 0,001 mm accuracy-.

BR,

Your lapping fool Timo

View attachment 2595

Click to expand...

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Friend lapping fool Timo:


Looks very good.....


Next, machine a jag on the end of your lapping rod....


Half to 5/8 inch long is plenty.......


Something like this.....doesn't have to be fancy.....





You notice the edges of the jag teeth are rounded slightly........


Lead doesn't want to migrate into sharp V threads too well.......


This is important:


I'll be giving you thoughts as they come to me.......


Way too much to take time to place things in order...


So please keep notes, then arrange them in order to suite you Finish folks...


Here's one:


Right before you insert the lapping rod into the bore, the jag must be quickly heated to a red temp...


I mean very quickly, as you'll have cotton lead restraining string wrapped around the lapping rod right next to the jag, and you do not want to burn the cotton string....

This takes some practice......and must be done quickly....


You then quickly inserted the rod into the bore and as quickly as possible pour the lap.....


Without heating the jag, the lead will not stick to it.....it will simply bounce away when the lap is poured..


Please take note of this......



More later.....


Your pistol fool friend, Bill Calfee

Friend lapping fool Timo

Friend lapping fool Timo


Friend lapping fool Timo:


Don't spend a bunch of time on the jag tip.....


Although, it must be integral to the lapping rod......no separate jag.....



Here's another doodle....and the first one...








Something similar to either of these is fine.....


Nothing fancy.......is required....


Your pistol fool friend, BC

Main student Juha escape from school and need maybe detention.He goes again to fishing about 500 miles to north.But just promise about 10 inches snow to this area and I think he is coming to south faster-.
He is back in few days.

This time I put picture Juha sended to me and I have no idea what it is but I think it is coming to button rifling machine...

BR, Timo

Friend lapping fool Timo.

Friend lapping fool Timo.


Friend lapping fool Timo:


Here's a doodle of the jag, that is more to scale.....






The main idea is that sharp V teeth on the jag don't accept the lead like slightly rounded teeth do.


Here's a picture of a lap that has bonded perfectly with the jag...





If you look closely you and see the radius on the rod at the beginning of the jag...


Once the lap has been cast, the lap is trimmed exposing this radius slightly...


Please make note of all this, cause there's no particular order to it......


I'll post as something comes to my mind....


Your pistol fool friend, BC



You Finish guys have a "working shop"......like mine.....

Hi Bill!

Enough snow to north...Main student is back on the saddle.Picture.

BR, Timo

Friend lapping fool Timo

Timo said:

Hi Bill!

Enough snow to north...Main student is back on the saddle.Picture.

BR, Timo

View attachment 2642

Click to expand...

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Friend lapping fool Timo:



Excellent........


Next.......a funnel for pouring the lead into the bore.....


Made from target thickness paper....


I'll have to make one and take pictures....


Which I'll do soon.............


Your lapping teacher fool, BC