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Marking holes on engine mounts

an easy way....

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Peter Miller20/05/2009 08:57:58
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10168 forum posts
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Here is one to start you off.
 
When marking out the holes on a nylon engine mount, paint the arms with Tippex. Then mark through with a suitable pen. I use a Parker ballpoint refill as that goes throught the engine bolt holes perfectly
Garry Pollard20/05/2009 11:33:31
1091 forum posts
By goodness there are some clever blokes on this forum. Thanks for that will use it on electric
Garry
Klippy20/05/2009 11:58:08
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That's another nice tip, but who can afford Parker?
Bruce Richards20/05/2009 12:28:32
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1849 forum posts
£2 is not a lot to avoid ruining an engine mount and its reusable.
Stephen Grigg20/05/2009 12:50:55
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8691 forum posts
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Good idea Peter ,thatll make things easier
Phil Claridge21/05/2009 08:48:53
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1924 forum posts
32 photos
there is a tool for doing this called a great planes center, it basically a 2mm drill on a 15cm shaft it has an outer tube which centers itself in the engine mount hole and allows you to drill a small pilot hole so your proper drill bit dosent slip, you can even use it with the cowl on. also useful for marking servo holes in tight places
Peter Miller21/05/2009 08:53:18
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10168 forum posts
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I can't help feeling that mine is possibly a bit cheaper and easier to find
I do have another method. LOng series drills, about 6 inches long but only 1.5 mm dia. even more expensive.
Phil Claridge21/05/2009 09:54:23
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hello peter the great planes DEAD CENTER to give its proper name costs about £7 and would make a nice little present for a modeller. the long drill series is a good idea i have some of these 12in long they are wood bits with a short point to start them, i bought them at our local market £1each, never thought to use them for engine mouting though. ihave 2mm 3mm 5mm 6mm, they are handy for reaching deep into fusalages for drilling holes for control snakes
Phil Claridge21/05/2009 09:58:19
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1924 forum posts
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ps if anybody wants some ican see if they are still available and get some at cost +post
Myron Beaumont21/05/2009 11:52:25
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5797 forum posts
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I can't believe it ! (Now who said that? )
I stick a sharp pencil in the engine mounting holes and move it in every direction ---You end up with a big black blob & then you stick a pointed something in the middle to enable you to find a centre for a drill bit (don't forget your safety goggles of course ) H&S rules for idiots  You don't need to buy any special tools !
( as the artmistress said to the gardener)  Sorry Ken !
Doug Ireland21/05/2009 12:14:58
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2088 forum posts
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I use a similar method to Peter's but I use masking tape instead of Tippex.
Phil Claridge22/05/2009 07:57:34
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of course you dont need special tools myron, a lada will get you from a to b but a roll's will get you there faster and more comfortably.pencils have to be sharpened if and when i can find one then wheres the scalpel?oops no blade put in new blade and then ruin it, use pencel sharpener you say had dozens cant find one, anyway i LIKE gadgets so there
Steve Hargreaves - Moderator22/05/2009 09:39:52
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I'm with Phil on this one.....I bought a Great Planes Dead Centre as soon as I saw one.....brilliant, brilliant, brilliant & why didn't I think of it before!!!!!!!
 
Used all the time for just about any hole.....engines, servos, motor mounts.....holes end up dead in the middle rather than off to one side...I can't praise it highly enough!!!!
 
Next to an inflatable Tony Nijhuis I can't think of a more useful thing to have in the workshop........!!!!
Phil Claridge23/05/2009 06:59:38
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1924 forum posts
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nice one steve i bought a bag of thirty pencils sharpened five and put one on each bench, where they promptly evaporated. my missus had a collection of toy pencil sharpeners ten in all, borrowed them all and they evaporated too

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